File: __init__.py

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"""
Theano is an optimizing compiler in Python, built to evaluate
complicated expressions (especially matrix-valued ones) as quickly as
possible.  Theano compiles expression graphs (see :doc:`graph` ) that
are built by Python code. The expressions in these graphs are called
`Apply` nodes and the variables in these graphs are called `Variable`
nodes.

You compile a graph by calling `function`, which takes a graph, and
returns a callable object.  One of theano's most important features is
that `function` can transform your graph before compiling it.  It can
replace simple expressions with faster or more numerically stable
implementations.

To learn more, check out:

- Op List (:doc:`oplist`)

The markup language used in the docstrings is ReStructured Text,
which may be rendered with Sphinx. A rendered version is
maintained at http://www.deeplearning.net/software/theano/library/

"""
from __future__ import absolute_import, print_function, division

__docformat__ = "restructuredtext en"

# Set a default logger. It is important to do this before importing some other
# theano code, since this code may want to log some messages.
import logging
import os
import sys
import warnings


def has_handlers(logger):
    # copied from Logger.hasHandlers() (introduced in Python 3.2)
    _logger = logger
    _has_handler = False
    while _logger:
        if _logger.handlers:
            _has_handler = True
            break
        if not _logger.propagate:
            break
        else:
            _logger = _logger.parent
    return _has_handler

theano_logger = logging.getLogger("theano")
logging_default_handler = logging.StreamHandler()
logging_default_formatter = logging.Formatter(
    fmt='%(levelname)s (%(name)s): %(message)s')
logging_default_handler.setFormatter(logging_default_formatter)
theano_logger.setLevel(logging.WARNING)

if has_handlers(theano_logger) is False:
    theano_logger.addHandler(logging_default_handler)


# Disable default log handler added to theano_logger when the module
# is imported.
def disable_log_handler(logger=theano_logger, handler=logging_default_handler):
    if has_handlers(logger):
        logger.removeHandler(handler)

# Version information.
from theano.version import version as __version__

# Raise a meaning full warning/error if the theano directory is in the
# Python path.
from six import PY3
rpath = os.path.realpath(__path__[0])
for p in sys.path:
    if os.path.realpath(p) != rpath:
        continue
    if PY3:
        raise RuntimeError(
            "You have the theano directory in your Python path."
            " This do not work in Python 3.")
    else:
        warnings.warn(
            "You have the theano directory in your Python path."
            " This is will not work in Python 3.")
    break


from theano.configdefaults import config
from theano.configparser import change_flags

# This is the api version for ops that generate C code.  External ops
# might need manual changes if this number goes up.  An undefined
# __api_version__ can be understood to mean api version 0.
#
# This number is not tied to the release version and should change
# very rarely.
__api_version__ = 1

from theano.gof import (
    CLinker, OpWiseCLinker, DualLinker, Linker, LocalLinker, PerformLinker,
    Container,
    InconsistencyError, FunctionGraph,
    Apply, Variable, Constant,
    Op, OpenMPOp,
    opt,
    toolbox,
    Type, Generic, generic,
    object2, utils)

from theano.compile import (
    SymbolicInput, In,
    SymbolicOutput, Out,
    Mode,
    predefined_modes, predefined_linkers, predefined_optimizers,
    FunctionMaker, function, function_dump,
    OpFromGraph,
    ProfileStats,
    Param, shared, as_op)

from theano.misc.safe_asarray import _asarray

from theano.printing import pprint, pp

from theano.scan_module import (scan, map, reduce, foldl, foldr, clone,
                                scan_checkpoints)

from theano.updates import OrderedUpdates

# scan_module import above initializes tensor and scalar making these imports
# redundant

# import tensor
# import scalar

# we don't import by default as we don't want to force having scipy installed.

# import sparse

from theano.gradient import Rop, Lop, grad, subgraph_grad

# This need to be before the init of GPU, as it add config variable
# needed during that phase.
import theano.tests
if hasattr(theano.tests, "TheanoNoseTester"):
    test = theano.tests.TheanoNoseTester().test
else:
    def test():
        raise ImportError("The nose module is not installed."
                          " It is needed for Theano tests.")

if (config.device.startswith('cuda') or
        config.device.startswith('opencl') or
        config.init_gpu_device.startswith('cuda') or
        config.init_gpu_device.startswith('opencl') or
        config.contexts != ''):
    import theano.gpuarray

# Use config.numpy to call numpy.seterr
import numpy as np

if config.numpy.seterr_all == 'None':
    _all = None
else:
    _all = config.numpy.seterr_all
if config.numpy.seterr_divide == 'None':
    _divide = None
else:
    _divide = config.numpy.seterr_divide
if config.numpy.seterr_over == 'None':
    _over = None
else:
    _over = config.numpy.seterr_over
if config.numpy.seterr_under == 'None':
    _under = None
else:
    _under = config.numpy.seterr_under
if config.numpy.seterr_invalid == 'None':
    _invalid = None
else:
    _invalid = config.numpy.seterr_invalid
np.seterr(
    all=_all,
    divide=_divide,
    over=_over,
    under=_under,
    invalid=_invalid)
del _all, _divide, _over, _under, _invalid

# This is defined here because it is designed to work across symbolic
#   datatypes (Sparse and Tensor)


def dot(l, r):
    """Return a symbolic matrix/dot product between l and r """
    rval = NotImplemented
    e0, e1 = None, None

    if rval == NotImplemented and hasattr(l, '__dot__'):
        try:
            rval = l.__dot__(r)
        except Exception as e0:
            rval = NotImplemented
    if rval == NotImplemented and hasattr(r, '__rdot__'):
        try:
            rval = r.__rdot__(l)
        except Exception as e1:
            rval = NotImplemented
    if rval == NotImplemented:
        raise NotImplementedError("Dot failed for the following reasons:",
                                  (e0, e1))
    return rval


def get_scalar_constant_value(v):
    """return the constant scalar(0-D) value underlying variable `v`

    If v is the output of dimshuffles, fills, allocs, rebroadcasts, cast
    this function digs through them.

    If theano.sparse is also there, we will look over CSM op.

    If `v` is not some view of constant data, then raise a
    tensor.basic.NotScalarConstantError.
    """
    # Is it necessary to test for presence of theano.sparse at runtime?
    if 'sparse' in globals() and isinstance(v.type, sparse.SparseType):
        if v.owner is not None and isinstance(v.owner.op, sparse.CSM):
            data = v.owner.inputs[0]
            return tensor.get_scalar_constant_value(data)
    return tensor.get_scalar_constant_value(v)


def sparse_grad(var):
    """This function return a new variable whose gradient will be
    stored in a sparse format instead of dense.

    Currently only variable created by AdvancedSubtensor1 is supported.
    i.e. a_tensor_var[an_int_vector].

    .. versionadded:: 0.6rc4
    """
    assert isinstance(var.owner.op, tensor.AdvancedSubtensor1)
    ret = var.owner.op.__class__(sparse_grad=True)(*var.owner.inputs)
    return ret


__import__('theano.tensor.shared_randomstreams')