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1011 lines
39 KiB
Python
1011 lines
39 KiB
Python
"""
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A context object for caching a function's return value each time it
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is called with the same input arguments.
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"""
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# Author: Gael Varoquaux <gael dot varoquaux at normalesup dot org>
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# Copyright (c) 2009 Gael Varoquaux
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# License: BSD Style, 3 clauses.
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from __future__ import with_statement
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import os
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import time
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import pydoc
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import re
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import functools
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import traceback
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import warnings
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import inspect
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import sys
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import weakref
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# Local imports
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from . import hashing
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from .func_inspect import get_func_code, get_func_name, filter_args
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from .func_inspect import format_call
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from .func_inspect import format_signature
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from ._memory_helpers import open_py_source
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from .logger import Logger, format_time, pformat
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from ._compat import _basestring, PY3_OR_LATER
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from ._store_backends import StoreBackendBase, FileSystemStoreBackend
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if sys.version_info[:2] >= (3, 4):
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import pathlib
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FIRST_LINE_TEXT = "# first line:"
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# TODO: The following object should have a data store object as a sub
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# object, and the interface to persist and query should be separated in
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# the data store.
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#
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# This would enable creating 'Memory' objects with a different logic for
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# pickling that would simply span a MemorizedFunc with the same
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# store (or do we want to copy it to avoid cross-talks?), for instance to
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# implement HDF5 pickling.
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# TODO: Same remark for the logger, and probably use the Python logging
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# mechanism.
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def extract_first_line(func_code):
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""" Extract the first line information from the function code
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text if available.
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"""
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if func_code.startswith(FIRST_LINE_TEXT):
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func_code = func_code.split('\n')
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first_line = int(func_code[0][len(FIRST_LINE_TEXT):])
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func_code = '\n'.join(func_code[1:])
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else:
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first_line = -1
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return func_code, first_line
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class JobLibCollisionWarning(UserWarning):
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""" Warn that there might be a collision between names of functions.
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"""
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_STORE_BACKENDS = {'local': FileSystemStoreBackend}
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def register_store_backend(backend_name, backend):
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"""Extend available store backends.
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The Memory, MemorizeResult and MemorizeFunc objects are designed to be
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agnostic to the type of store used behind. By default, the local file
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system is used but this function gives the possibility to extend joblib's
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memory pattern with other types of storage such as cloud storage (S3, GCS,
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OpenStack, HadoopFS, etc) or blob DBs.
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Parameters
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----------
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backend_name: str
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The name identifying the store backend being registered. For example,
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'local' is used with FileSystemStoreBackend.
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backend: StoreBackendBase subclass
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The name of a class that implements the StoreBackendBase interface.
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"""
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if not isinstance(backend_name, _basestring):
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raise ValueError("Store backend name should be a string, "
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"'{0}' given.".format(backend_name))
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if backend is None or not issubclass(backend, StoreBackendBase):
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raise ValueError("Store backend should inherit "
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"StoreBackendBase, "
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"'{0}' given.".format(backend))
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_STORE_BACKENDS[backend_name] = backend
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def _store_backend_factory(backend, location, verbose=0, backend_options=None):
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"""Return the correct store object for the given location."""
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if backend_options is None:
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backend_options = {}
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if (sys.version_info[:2] >= (3, 4) and isinstance(location, pathlib.Path)):
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location = str(location)
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if isinstance(location, StoreBackendBase):
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return location
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elif isinstance(location, _basestring):
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obj = None
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location = os.path.expanduser(location)
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# The location is not a local file system, we look in the
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# registered backends if there's one matching the given backend
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# name.
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for backend_key, backend_obj in _STORE_BACKENDS.items():
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if backend == backend_key:
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obj = backend_obj()
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# By default, we assume the FileSystemStoreBackend can be used if no
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# matching backend could be found.
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if obj is None:
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raise TypeError('Unknown location {0} or backend {1}'.format(
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location, backend))
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# The store backend is configured with the extra named parameters,
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# some of them are specific to the underlying store backend.
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obj.configure(location, verbose=verbose,
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backend_options=backend_options)
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return obj
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elif location is not None:
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warnings.warn(
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"Instanciating a backend using a {} as a location is not "
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"supported by joblib. Returning None instead.".format(
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location.__class__.__name__), UserWarning)
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return None
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def _get_func_fullname(func):
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"""Compute the part of part associated with a function."""
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modules, funcname = get_func_name(func)
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modules.append(funcname)
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return os.path.join(*modules)
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def _build_func_identifier(func):
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"""Build a roughly unique identifier for the cached function."""
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parts = []
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if isinstance(func, _basestring):
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parts.append(func)
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else:
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parts.append(_get_func_fullname(func))
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# We reuse historical fs-like way of building a function identifier
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return os.path.join(*parts)
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def _format_load_msg(func_id, args_id, timestamp=None, metadata=None):
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""" Helper function to format the message when loading the results.
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"""
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signature = ""
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try:
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if metadata is not None:
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args = ", ".join(['%s=%s' % (name, value)
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for name, value
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in metadata['input_args'].items()])
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signature = "%s(%s)" % (os.path.basename(func_id), args)
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else:
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signature = os.path.basename(func_id)
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except KeyError:
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pass
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if timestamp is not None:
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ts_string = "{0: <16}".format(format_time(time.time() - timestamp))
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else:
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ts_string = ""
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return '[Memory]{0}: Loading {1}'.format(ts_string, str(signature))
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# An in-memory store to avoid looking at the disk-based function
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# source code to check if a function definition has changed
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_FUNCTION_HASHES = weakref.WeakKeyDictionary()
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###############################################################################
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# class `MemorizedResult`
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###############################################################################
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class MemorizedResult(Logger):
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"""Object representing a cached value.
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Attributes
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----------
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location: str
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The location of joblib cache. Depends on the store backend used.
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func: function or str
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function whose output is cached. The string case is intended only for
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instanciation based on the output of repr() on another instance.
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(namely eval(repr(memorized_instance)) works).
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argument_hash: str
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hash of the function arguments.
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backend: str
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Type of store backend for reading/writing cache files.
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Default is 'local'.
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mmap_mode: {None, 'r+', 'r', 'w+', 'c'}
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The memmapping mode used when loading from cache numpy arrays. See
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numpy.load for the meaning of the different values.
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verbose: int
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verbosity level (0 means no message).
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timestamp, metadata: string
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for internal use only.
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"""
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def __init__(self, location, func, args_id, backend='local',
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mmap_mode=None, verbose=0, timestamp=None, metadata=None):
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Logger.__init__(self)
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self.func_id = _build_func_identifier(func)
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if isinstance(func, _basestring):
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self.func = func
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else:
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self.func = self.func_id
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self.args_id = args_id
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self.store_backend = _store_backend_factory(backend, location,
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verbose=verbose)
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self.mmap_mode = mmap_mode
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if metadata is not None:
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self.metadata = metadata
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else:
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self.metadata = self.store_backend.get_metadata(
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[self.func_id, self.args_id])
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self.duration = self.metadata.get('duration', None)
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self.verbose = verbose
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self.timestamp = timestamp
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@property
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def argument_hash(self):
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warnings.warn(
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"The 'argument_hash' attribute has been deprecated in version "
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"0.12 and will be removed in version 0.14.\n"
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"Use `args_id` attribute instead.",
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DeprecationWarning, stacklevel=2)
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return self.args_id
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def get(self):
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"""Read value from cache and return it."""
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if self.verbose:
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msg = _format_load_msg(self.func_id, self.args_id,
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timestamp=self.timestamp,
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metadata=self.metadata)
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else:
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msg = None
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try:
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return self.store_backend.load_item(
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[self.func_id, self.args_id], msg=msg, verbose=self.verbose)
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except (ValueError, KeyError) as exc:
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# KeyError is expected under Python 2.7, ValueError under Python 3
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new_exc = KeyError(
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"Error while trying to load a MemorizedResult's value. "
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"It seems that this folder is corrupted : {}".format(
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os.path.join(
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self.store_backend.location, self.func_id,
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self.args_id)
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))
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new_exc.__cause__ = exc
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raise new_exc
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def clear(self):
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"""Clear value from cache"""
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self.store_backend.clear_item([self.func_id, self.args_id])
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def __repr__(self):
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return ('{class_name}(location="{location}", func="{func}", '
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'args_id="{args_id}")'
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.format(class_name=self.__class__.__name__,
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location=self.store_backend.location,
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func=self.func,
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args_id=self.args_id
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))
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def __getstate__(self):
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state = self.__dict__.copy()
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state['timestamp'] = None
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return state
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class NotMemorizedResult(object):
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"""Class representing an arbitrary value.
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This class is a replacement for MemorizedResult when there is no cache.
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"""
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__slots__ = ('value', 'valid')
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def __init__(self, value):
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self.value = value
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self.valid = True
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def get(self):
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if self.valid:
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return self.value
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else:
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raise KeyError("No value stored.")
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def clear(self):
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self.valid = False
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self.value = None
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def __repr__(self):
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if self.valid:
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return ('{class_name}({value})'
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.format(class_name=self.__class__.__name__,
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value=pformat(self.value)))
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else:
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return self.__class__.__name__ + ' with no value'
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# __getstate__ and __setstate__ are required because of __slots__
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def __getstate__(self):
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return {"valid": self.valid, "value": self.value}
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def __setstate__(self, state):
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self.valid = state["valid"]
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self.value = state["value"]
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###############################################################################
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# class `NotMemorizedFunc`
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###############################################################################
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class NotMemorizedFunc(object):
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"""No-op object decorating a function.
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This class replaces MemorizedFunc when there is no cache. It provides an
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identical API but does not write anything on disk.
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Attributes
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----------
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func: callable
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Original undecorated function.
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"""
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# Should be a light as possible (for speed)
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def __init__(self, func):
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self.func = func
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def __call__(self, *args, **kwargs):
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return self.func(*args, **kwargs)
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def call_and_shelve(self, *args, **kwargs):
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return NotMemorizedResult(self.func(*args, **kwargs))
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def __repr__(self):
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return '{0}(func={1})'.format(self.__class__.__name__, self.func)
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def clear(self, warn=True):
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# Argument "warn" is for compatibility with MemorizedFunc.clear
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pass
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|
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###############################################################################
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# class `MemorizedFunc`
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###############################################################################
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class MemorizedFunc(Logger):
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"""Callable object decorating a function for caching its return value
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each time it is called.
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Methods are provided to inspect the cache or clean it.
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Attributes
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----------
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func: callable
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The original, undecorated, function.
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location: string
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The location of joblib cache. Depends on the store backend used.
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backend: str
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Type of store backend for reading/writing cache files.
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Default is 'local', in which case the location is the path to a
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disk storage.
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ignore: list or None
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List of variable names to ignore when choosing whether to
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recompute.
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mmap_mode: {None, 'r+', 'r', 'w+', 'c'}
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The memmapping mode used when loading from cache
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numpy arrays. See numpy.load for the meaning of the different
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values.
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compress: boolean, or integer
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Whether to zip the stored data on disk. If an integer is
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given, it should be between 1 and 9, and sets the amount
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of compression. Note that compressed arrays cannot be
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read by memmapping.
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verbose: int, optional
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The verbosity flag, controls messages that are issued as
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the function is evaluated.
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"""
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# ------------------------------------------------------------------------
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# Public interface
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# ------------------------------------------------------------------------
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def __init__(self, func, location, backend='local', ignore=None,
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mmap_mode=None, compress=False, verbose=1, timestamp=None):
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Logger.__init__(self)
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self.mmap_mode = mmap_mode
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self.compress = compress
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self.func = func
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if ignore is None:
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ignore = []
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self.ignore = ignore
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self._verbose = verbose
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# retrieve store object from backend type and location.
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self.store_backend = _store_backend_factory(backend, location,
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verbose=verbose,
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backend_options=dict(
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compress=compress,
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mmap_mode=mmap_mode),
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)
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if self.store_backend is not None:
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# Create func directory on demand.
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self.store_backend.\
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store_cached_func_code([_build_func_identifier(self.func)])
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if timestamp is None:
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timestamp = time.time()
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self.timestamp = timestamp
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try:
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functools.update_wrapper(self, func)
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except:
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" Objects like ufunc don't like that "
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if inspect.isfunction(func):
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doc = pydoc.TextDoc().document(func)
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# Remove blank line
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doc = doc.replace('\n', '\n\n', 1)
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# Strip backspace-overprints for compatibility with autodoc
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doc = re.sub('\x08.', '', doc)
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else:
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# Pydoc does a poor job on other objects
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doc = func.__doc__
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self.__doc__ = 'Memoized version of %s' % doc
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def _cached_call(self, args, kwargs, shelving=False):
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"""Call wrapped function and cache result, or read cache if available.
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This function returns the wrapped function output and some metadata.
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Arguments:
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----------
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|
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args, kwargs: list and dict
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input arguments for wrapped function
|
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|
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shelving: bool
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True when called via the call_and_shelve function.
|
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|
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Returns
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-------
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output: value or tuple or None
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Output of the wrapped function.
|
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If shelving is True and the call has been already cached,
|
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output is None.
|
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|
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argument_hash: string
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Hash of function arguments.
|
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|
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metadata: dict
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Some metadata about wrapped function call (see _persist_input()).
|
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"""
|
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func_id, args_id = self._get_output_identifiers(*args, **kwargs)
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metadata = None
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msg = None
|
|
|
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# Wether or not the memorized function must be called
|
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must_call = False
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|
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# FIXME: The statements below should be try/excepted
|
|
# Compare the function code with the previous to see if the
|
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# function code has changed
|
|
if not (self._check_previous_func_code(stacklevel=4) and
|
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self.store_backend.contains_item([func_id, args_id])):
|
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if self._verbose > 10:
|
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_, name = get_func_name(self.func)
|
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self.warn('Computing func {0}, argument hash {1} '
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'in location {2}'
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.format(name, args_id,
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self.store_backend.
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get_cached_func_info([func_id])['location']))
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must_call = True
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else:
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try:
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t0 = time.time()
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if self._verbose:
|
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msg = _format_load_msg(func_id, args_id,
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timestamp=self.timestamp,
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metadata=metadata)
|
|
|
|
if not shelving:
|
|
# When shelving, we do not need to load the output
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|
out = self.store_backend.load_item(
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[func_id, args_id],
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msg=msg,
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verbose=self._verbose)
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else:
|
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out = None
|
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|
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if self._verbose > 4:
|
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t = time.time() - t0
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_, name = get_func_name(self.func)
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msg = '%s cache loaded - %s' % (name, format_time(t))
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print(max(0, (80 - len(msg))) * '_' + msg)
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except Exception:
|
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# XXX: Should use an exception logger
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_, signature = format_signature(self.func, *args, **kwargs)
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self.warn('Exception while loading results for '
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'{}\n {}'.format(signature, traceback.format_exc()))
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|
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must_call = True
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|
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if must_call:
|
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out, metadata = self.call(*args, **kwargs)
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if self.mmap_mode is not None:
|
|
# Memmap the output at the first call to be consistent with
|
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# later calls
|
|
if self._verbose:
|
|
msg = _format_load_msg(func_id, args_id,
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timestamp=self.timestamp,
|
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metadata=metadata)
|
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out = self.store_backend.load_item([func_id, args_id], msg=msg,
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verbose=self._verbose)
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|
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return (out, args_id, metadata)
|
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|
|
def call_and_shelve(self, *args, **kwargs):
|
|
"""Call wrapped function, cache result and return a reference.
|
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|
|
This method returns a reference to the cached result instead of the
|
|
result itself. The reference object is small and pickeable, allowing
|
|
to send or store it easily. Call .get() on reference object to get
|
|
result.
|
|
|
|
Returns
|
|
-------
|
|
cached_result: MemorizedResult or NotMemorizedResult
|
|
reference to the value returned by the wrapped function. The
|
|
class "NotMemorizedResult" is used when there is no cache
|
|
activated (e.g. location=None in Memory).
|
|
"""
|
|
_, args_id, metadata = self._cached_call(args, kwargs, shelving=True)
|
|
return MemorizedResult(self.store_backend, self.func, args_id,
|
|
metadata=metadata, verbose=self._verbose - 1,
|
|
timestamp=self.timestamp)
|
|
|
|
def __call__(self, *args, **kwargs):
|
|
return self._cached_call(args, kwargs)[0]
|
|
|
|
def __getstate__(self):
|
|
""" We don't store the timestamp when pickling, to avoid the hash
|
|
depending from it.
|
|
"""
|
|
state = self.__dict__.copy()
|
|
state['timestamp'] = None
|
|
return state
|
|
|
|
# ------------------------------------------------------------------------
|
|
# Private interface
|
|
# ------------------------------------------------------------------------
|
|
|
|
def _get_argument_hash(self, *args, **kwargs):
|
|
return hashing.hash(filter_args(self.func, self.ignore, args, kwargs),
|
|
coerce_mmap=(self.mmap_mode is not None))
|
|
|
|
def _get_output_identifiers(self, *args, **kwargs):
|
|
"""Return the func identifier and input parameter hash of a result."""
|
|
func_id = _build_func_identifier(self.func)
|
|
argument_hash = self._get_argument_hash(*args, **kwargs)
|
|
return func_id, argument_hash
|
|
|
|
def _hash_func(self):
|
|
"""Hash a function to key the online cache"""
|
|
func_code_h = hash(getattr(self.func, '__code__', None))
|
|
return id(self.func), hash(self.func), func_code_h
|
|
|
|
def _write_func_code(self, func_code, first_line):
|
|
""" Write the function code and the filename to a file.
|
|
"""
|
|
# We store the first line because the filename and the function
|
|
# name is not always enough to identify a function: people
|
|
# sometimes have several functions named the same way in a
|
|
# file. This is bad practice, but joblib should be robust to bad
|
|
# practice.
|
|
func_id = _build_func_identifier(self.func)
|
|
func_code = u'%s %i\n%s' % (FIRST_LINE_TEXT, first_line, func_code)
|
|
self.store_backend.store_cached_func_code([func_id], func_code)
|
|
|
|
# Also store in the in-memory store of function hashes
|
|
is_named_callable = False
|
|
if PY3_OR_LATER:
|
|
is_named_callable = (hasattr(self.func, '__name__') and
|
|
self.func.__name__ != '<lambda>')
|
|
else:
|
|
is_named_callable = (hasattr(self.func, 'func_name') and
|
|
self.func.func_name != '<lambda>')
|
|
if is_named_callable:
|
|
# Don't do this for lambda functions or strange callable
|
|
# objects, as it ends up being too fragile
|
|
func_hash = self._hash_func()
|
|
try:
|
|
_FUNCTION_HASHES[self.func] = func_hash
|
|
except TypeError:
|
|
# Some callable are not hashable
|
|
pass
|
|
|
|
def _check_previous_func_code(self, stacklevel=2):
|
|
"""
|
|
stacklevel is the depth a which this function is called, to
|
|
issue useful warnings to the user.
|
|
"""
|
|
# First check if our function is in the in-memory store.
|
|
# Using the in-memory store not only makes things faster, but it
|
|
# also renders us robust to variations of the files when the
|
|
# in-memory version of the code does not vary
|
|
try:
|
|
if self.func in _FUNCTION_HASHES:
|
|
# We use as an identifier the id of the function and its
|
|
# hash. This is more likely to falsely change than have hash
|
|
# collisions, thus we are on the safe side.
|
|
func_hash = self._hash_func()
|
|
if func_hash == _FUNCTION_HASHES[self.func]:
|
|
return True
|
|
except TypeError:
|
|
# Some callables are not hashable
|
|
pass
|
|
|
|
# Here, we go through some effort to be robust to dynamically
|
|
# changing code and collision. We cannot inspect.getsource
|
|
# because it is not reliable when using IPython's magic "%run".
|
|
func_code, source_file, first_line = get_func_code(self.func)
|
|
func_id = _build_func_identifier(self.func)
|
|
|
|
try:
|
|
old_func_code, old_first_line =\
|
|
extract_first_line(
|
|
self.store_backend.get_cached_func_code([func_id]))
|
|
except (IOError, OSError): # some backend can also raise OSError
|
|
self._write_func_code(func_code, first_line)
|
|
return False
|
|
if old_func_code == func_code:
|
|
return True
|
|
|
|
# We have differing code, is this because we are referring to
|
|
# different functions, or because the function we are referring to has
|
|
# changed?
|
|
|
|
_, func_name = get_func_name(self.func, resolv_alias=False,
|
|
win_characters=False)
|
|
if old_first_line == first_line == -1 or func_name == '<lambda>':
|
|
if not first_line == -1:
|
|
func_description = ("{0} ({1}:{2})"
|
|
.format(func_name, source_file,
|
|
first_line))
|
|
else:
|
|
func_description = func_name
|
|
warnings.warn(JobLibCollisionWarning(
|
|
"Cannot detect name collisions for function '{0}'"
|
|
.format(func_description)), stacklevel=stacklevel)
|
|
|
|
# Fetch the code at the old location and compare it. If it is the
|
|
# same than the code store, we have a collision: the code in the
|
|
# file has not changed, but the name we have is pointing to a new
|
|
# code block.
|
|
if not old_first_line == first_line and source_file is not None:
|
|
possible_collision = False
|
|
if os.path.exists(source_file):
|
|
_, func_name = get_func_name(self.func, resolv_alias=False)
|
|
num_lines = len(func_code.split('\n'))
|
|
with open_py_source(source_file) as f:
|
|
on_disk_func_code = f.readlines()[
|
|
old_first_line - 1:old_first_line - 1 + num_lines - 1]
|
|
on_disk_func_code = ''.join(on_disk_func_code)
|
|
possible_collision = (on_disk_func_code.rstrip() ==
|
|
old_func_code.rstrip())
|
|
else:
|
|
possible_collision = source_file.startswith('<doctest ')
|
|
if possible_collision:
|
|
warnings.warn(JobLibCollisionWarning(
|
|
'Possible name collisions between functions '
|
|
"'%s' (%s:%i) and '%s' (%s:%i)" %
|
|
(func_name, source_file, old_first_line,
|
|
func_name, source_file, first_line)),
|
|
stacklevel=stacklevel)
|
|
|
|
# The function has changed, wipe the cache directory.
|
|
# XXX: Should be using warnings, and giving stacklevel
|
|
if self._verbose > 10:
|
|
_, func_name = get_func_name(self.func, resolv_alias=False)
|
|
self.warn("Function {0} (identified by {1}) has changed"
|
|
".".format(func_name, func_id))
|
|
self.clear(warn=True)
|
|
return False
|
|
|
|
def clear(self, warn=True):
|
|
"""Empty the function's cache."""
|
|
func_id = _build_func_identifier(self.func)
|
|
|
|
if self._verbose > 0 and warn:
|
|
self.warn("Clearing function cache identified by %s" % func_id)
|
|
self.store_backend.clear_path([func_id, ])
|
|
|
|
func_code, _, first_line = get_func_code(self.func)
|
|
self._write_func_code(func_code, first_line)
|
|
|
|
def call(self, *args, **kwargs):
|
|
""" Force the execution of the function with the given arguments and
|
|
persist the output values.
|
|
"""
|
|
start_time = time.time()
|
|
func_id, args_id = self._get_output_identifiers(*args, **kwargs)
|
|
if self._verbose > 0:
|
|
print(format_call(self.func, args, kwargs))
|
|
output = self.func(*args, **kwargs)
|
|
self.store_backend.dump_item(
|
|
[func_id, args_id], output, verbose=self._verbose)
|
|
|
|
duration = time.time() - start_time
|
|
metadata = self._persist_input(duration, args, kwargs)
|
|
|
|
if self._verbose > 0:
|
|
_, name = get_func_name(self.func)
|
|
msg = '%s - %s' % (name, format_time(duration))
|
|
print(max(0, (80 - len(msg))) * '_' + msg)
|
|
return output, metadata
|
|
|
|
def _persist_input(self, duration, args, kwargs, this_duration_limit=0.5):
|
|
""" Save a small summary of the call using json format in the
|
|
output directory.
|
|
|
|
output_dir: string
|
|
directory where to write metadata.
|
|
|
|
duration: float
|
|
time taken by hashing input arguments, calling the wrapped
|
|
function and persisting its output.
|
|
|
|
args, kwargs: list and dict
|
|
input arguments for wrapped function
|
|
|
|
this_duration_limit: float
|
|
Max execution time for this function before issuing a warning.
|
|
"""
|
|
start_time = time.time()
|
|
argument_dict = filter_args(self.func, self.ignore,
|
|
args, kwargs)
|
|
|
|
input_repr = dict((k, repr(v)) for k, v in argument_dict.items())
|
|
# This can fail due to race-conditions with multiple
|
|
# concurrent joblibs removing the file or the directory
|
|
metadata = {"duration": duration, "input_args": input_repr}
|
|
|
|
func_id, args_id = self._get_output_identifiers(*args, **kwargs)
|
|
self.store_backend.store_metadata([func_id, args_id], metadata)
|
|
|
|
this_duration = time.time() - start_time
|
|
if this_duration > this_duration_limit:
|
|
# This persistence should be fast. It will not be if repr() takes
|
|
# time and its output is large, because json.dump will have to
|
|
# write a large file. This should not be an issue with numpy arrays
|
|
# for which repr() always output a short representation, but can
|
|
# be with complex dictionaries. Fixing the problem should be a
|
|
# matter of replacing repr() above by something smarter.
|
|
warnings.warn("Persisting input arguments took %.2fs to run.\n"
|
|
"If this happens often in your code, it can cause "
|
|
"performance problems \n"
|
|
"(results will be correct in all cases). \n"
|
|
"The reason for this is probably some large input "
|
|
"arguments for a wrapped\n"
|
|
" function (e.g. large strings).\n"
|
|
"THIS IS A JOBLIB ISSUE. If you can, kindly provide "
|
|
"the joblib's team with an\n"
|
|
" example so that they can fix the problem."
|
|
% this_duration, stacklevel=5)
|
|
return metadata
|
|
|
|
# XXX: Need a method to check if results are available.
|
|
|
|
# ------------------------------------------------------------------------
|
|
# Private `object` interface
|
|
# ------------------------------------------------------------------------
|
|
|
|
def __repr__(self):
|
|
return '{class_name}(func={func}, location={location})'.format(
|
|
class_name=self.__class__.__name__,
|
|
func=self.func,
|
|
location=self.store_backend.location,)
|
|
|
|
|
|
###############################################################################
|
|
# class `Memory`
|
|
###############################################################################
|
|
class Memory(Logger):
|
|
""" A context object for caching a function's return value each time it
|
|
is called with the same input arguments.
|
|
|
|
All values are cached on the filesystem, in a deep directory
|
|
structure.
|
|
|
|
Read more in the :ref:`User Guide <memory>`.
|
|
|
|
Parameters
|
|
----------
|
|
location: str or None
|
|
The path of the base directory to use as a data store
|
|
or None. If None is given, no caching is done and
|
|
the Memory object is completely transparent. This option
|
|
replaces cachedir since version 0.12.
|
|
|
|
backend: str, optional
|
|
Type of store backend for reading/writing cache files.
|
|
Default: 'local'.
|
|
The 'local' backend is using regular filesystem operations to
|
|
manipulate data (open, mv, etc) in the backend.
|
|
|
|
cachedir: str or None, optional
|
|
|
|
.. deprecated: 0.12
|
|
'cachedir' has been deprecated in 0.12 and will be
|
|
removed in 0.14. Use the 'location' parameter instead.
|
|
|
|
mmap_mode: {None, 'r+', 'r', 'w+', 'c'}, optional
|
|
The memmapping mode used when loading from cache
|
|
numpy arrays. See numpy.load for the meaning of the
|
|
arguments.
|
|
|
|
compress: boolean, or integer, optional
|
|
Whether to zip the stored data on disk. If an integer is
|
|
given, it should be between 1 and 9, and sets the amount
|
|
of compression. Note that compressed arrays cannot be
|
|
read by memmapping.
|
|
|
|
verbose: int, optional
|
|
Verbosity flag, controls the debug messages that are issued
|
|
as functions are evaluated.
|
|
|
|
bytes_limit: int, optional
|
|
Limit in bytes of the size of the cache.
|
|
|
|
backend_options: dict, optional
|
|
Contains a dictionnary of named parameters used to configure
|
|
the store backend.
|
|
"""
|
|
# ------------------------------------------------------------------------
|
|
# Public interface
|
|
# ------------------------------------------------------------------------
|
|
|
|
def __init__(self, location=None, backend='local', cachedir=None,
|
|
mmap_mode=None, compress=False, verbose=1, bytes_limit=None,
|
|
backend_options=None):
|
|
# XXX: Bad explanation of the None value of cachedir
|
|
Logger.__init__(self)
|
|
self._verbose = verbose
|
|
self.mmap_mode = mmap_mode
|
|
self.timestamp = time.time()
|
|
self.bytes_limit = bytes_limit
|
|
self.backend = backend
|
|
self.compress = compress
|
|
if backend_options is None:
|
|
backend_options = {}
|
|
self.backend_options = backend_options
|
|
|
|
if compress and mmap_mode is not None:
|
|
warnings.warn('Compressed results cannot be memmapped',
|
|
stacklevel=2)
|
|
if cachedir is not None:
|
|
if location is not None:
|
|
raise ValueError(
|
|
'You set both "location={0!r} and "cachedir={1!r}". '
|
|
"'cachedir' has been deprecated in version "
|
|
"0.12 and will be removed in version 0.14.\n"
|
|
'Please only set "location={0!r}"'.format(
|
|
location, cachedir))
|
|
|
|
warnings.warn(
|
|
"The 'cachedir' parameter has been deprecated in version "
|
|
"0.12 and will be removed in version 0.14.\n"
|
|
'You provided "cachedir={0!r}", '
|
|
'use "location={0!r}" instead.'.format(cachedir),
|
|
DeprecationWarning, stacklevel=2)
|
|
location = cachedir
|
|
|
|
self.location = location
|
|
if isinstance(location, _basestring):
|
|
location = os.path.join(location, 'joblib')
|
|
|
|
self.store_backend = _store_backend_factory(
|
|
backend, location, verbose=self._verbose,
|
|
backend_options=dict(compress=compress, mmap_mode=mmap_mode,
|
|
**backend_options))
|
|
|
|
@property
|
|
def cachedir(self):
|
|
warnings.warn(
|
|
"The 'cachedir' attribute has been deprecated in version 0.12 "
|
|
"and will be removed in version 0.14.\n"
|
|
"Use os.path.join(memory.location, 'joblib') attribute instead.",
|
|
DeprecationWarning, stacklevel=2)
|
|
if self.location is None:
|
|
return None
|
|
return os.path.join(self.location, 'joblib')
|
|
|
|
def cache(self, func=None, ignore=None, verbose=None, mmap_mode=False):
|
|
""" Decorates the given function func to only compute its return
|
|
value for input arguments not cached on disk.
|
|
|
|
Parameters
|
|
----------
|
|
func: callable, optional
|
|
The function to be decorated
|
|
ignore: list of strings
|
|
A list of arguments name to ignore in the hashing
|
|
verbose: integer, optional
|
|
The verbosity mode of the function. By default that
|
|
of the memory object is used.
|
|
mmap_mode: {None, 'r+', 'r', 'w+', 'c'}, optional
|
|
The memmapping mode used when loading from cache
|
|
numpy arrays. See numpy.load for the meaning of the
|
|
arguments. By default that of the memory object is used.
|
|
|
|
Returns
|
|
-------
|
|
decorated_func: MemorizedFunc object
|
|
The returned object is a MemorizedFunc object, that is
|
|
callable (behaves like a function), but offers extra
|
|
methods for cache lookup and management. See the
|
|
documentation for :class:`joblib.memory.MemorizedFunc`.
|
|
"""
|
|
if func is None:
|
|
# Partial application, to be able to specify extra keyword
|
|
# arguments in decorators
|
|
return functools.partial(self.cache, ignore=ignore,
|
|
verbose=verbose, mmap_mode=mmap_mode)
|
|
if self.store_backend is None:
|
|
return NotMemorizedFunc(func)
|
|
if verbose is None:
|
|
verbose = self._verbose
|
|
if mmap_mode is False:
|
|
mmap_mode = self.mmap_mode
|
|
if isinstance(func, MemorizedFunc):
|
|
func = func.func
|
|
return MemorizedFunc(func, location=self.store_backend,
|
|
backend=self.backend,
|
|
ignore=ignore, mmap_mode=mmap_mode,
|
|
compress=self.compress,
|
|
verbose=verbose, timestamp=self.timestamp)
|
|
|
|
def clear(self, warn=True):
|
|
""" Erase the complete cache directory.
|
|
"""
|
|
if warn:
|
|
self.warn('Flushing completely the cache')
|
|
if self.store_backend is not None:
|
|
self.store_backend.clear()
|
|
|
|
def reduce_size(self):
|
|
"""Remove cache elements to make cache size fit in ``bytes_limit``."""
|
|
if self.bytes_limit is not None and self.store_backend is not None:
|
|
self.store_backend.reduce_store_size(self.bytes_limit)
|
|
|
|
def eval(self, func, *args, **kwargs):
|
|
""" Eval function func with arguments `*args` and `**kwargs`,
|
|
in the context of the memory.
|
|
|
|
This method works similarly to the builtin `apply`, except
|
|
that the function is called only if the cache is not
|
|
up to date.
|
|
|
|
"""
|
|
if self.store_backend is None:
|
|
return func(*args, **kwargs)
|
|
return self.cache(func)(*args, **kwargs)
|
|
|
|
# ------------------------------------------------------------------------
|
|
# Private `object` interface
|
|
# ------------------------------------------------------------------------
|
|
|
|
def __repr__(self):
|
|
return '{class_name}(location={location})'.format(
|
|
class_name=self.__class__.__name__,
|
|
location=(None if self.store_backend is None
|
|
else self.store_backend.location))
|
|
|
|
def __getstate__(self):
|
|
""" We don't store the timestamp when pickling, to avoid the hash
|
|
depending from it.
|
|
"""
|
|
state = self.__dict__.copy()
|
|
state['timestamp'] = None
|
|
return state
|