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pytensor
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0f00c10f
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0f00c10f
authored
8月 13, 2015
作者:
Iban Harlouchet
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差异文件
numpydoc for theano/compile/function.py
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e6ecae1c
隐藏空白字符变更
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function.py
theano/compile/function.py
+68
-75
没有找到文件。
theano/compile/function.py
浏览文件 @
0f00c10f
"""Define the `function` function
"""
Define the `function` function.
"""
import
six.moves.cPickle
as
pickle
import
logging
...
...
@@ -23,8 +25,9 @@ def function_dump(filename, inputs, outputs=None, mode=None, updates=None,
no_default_updates
=
False
,
accept_inplace
=
False
,
name
=
None
,
rebuild_strict
=
True
,
allow_input_downcast
=
None
,
profile
=
None
,
on_unused_input
=
None
):
"""This is helpful to make a reproducable case for problem during
Theano compilation.
"""
This is helpful to make a reproducable case for problem during Theano
compilation.
Ex:
...
...
@@ -65,78 +68,67 @@ def function(inputs, outputs=None, mode=None, updates=None, givens=None,
"""
Return a callable object that will calculate `outputs` from `inputs`.
:type inputs: list of either Variable or Param instances.
:param inputs: function parameters, these are not allowed to be shared
variables
:type outputs: list or dict of Variables or Out instances. If it is a
dict, the keys must be strings
:param outputs: expressions to compute
:type mode: string or `Mode` instance.
:param mode: compilation mode
:type updates: iterable over pairs (shared_variable, new_expression).
List, tuple or OrderedDict.
:param updates: update the values for SharedVariable inputs
according to these expressions
:type givens: iterable over pairs (Var1, Var2) of Variables. List,
tuple or dict. The Var1 and Var2 in each pair must
have the same Type.
:param givens: specific substitutions to make in the computation
graph (Var2 replaces Var1).
:type no_default_updates: either bool or list of Variables
:param no_default_updates: if True, do not perform any automatic
update on Variables. If False (default), perform them
all. Else, perform automatic updates on all Variables that are
neither in "updates" nor in "no_default_updates".
:param name: an optional name for this function. The profile mode
will print the time spent in this function.
:param rebuild_strict: True (Default) is the safer and better
tested setting, in which case `givens` must substitute new
variables with the same Type as the variables they replace.
False is a you-better-know-what-you-are-doing setting, that
permits `givens` to replace variables with new variables of
any Type. The consequence of changing a Type is that all
results depending on that variable may have a different Type
too (the graph is rebuilt from inputs to outputs). If one of
the new types does not make sense for one of the Ops in the
graph, an Exception will be raised.
:type allow_input_downcast: Boolean or None
:param allow_input_downcast: True means that the values passed as
inputs when calling the function can be silently downcasted to
fit the dtype of the corresponding Variable, which may lose
precision. False means that it will only be cast to a more
general, or precise, type. None (default) is almost like
False, but allows downcasting of Python float scalars to
floatX.
:type profile: None, True, or ProfileStats instance
:param profile: accumulate profiling information into a given
ProfileStats instance. If argument is `True` then a new
ProfileStats instance will be used. This profiling object
will be available via self.profile.
:param on_unused_input: What to do if a variable in the 'inputs'
list is not used in the graph. Possible values are 'raise',
'warn', 'ignore' and None.
:rtype: Function instance
:returns: a callable object that will compute the outputs (given
the inputs) and update the implicit function arguments
according to the `updates`.
:note: Regarding givens: Be careful to make sure that these
substitutions are independent--behaviour when Var1 of one pair
appears in the graph leading to Var2 in another expression is
undefined. Replacements specified with givens are different
from optimizations in that Var2 is not expected to be
equivalent to Var1.
Parameters
----------
inputs : list of either Variable or Param instances.
Function parameters, these are not allowed to be shared variables.
outputs : list or dict of Variables or Out instances.
If it is a dict, the keys must be strings. Expressions to compute.
mode : string or `Mode` instance.
Compilation mode.
updates : iterable over pairs (shared_variable, new_expression). List, tuple
or OrderedDict.
Updates the values for SharedVariable inputs according to these
expressions.
givens : iterable over pairs (Var1, Var2) of Variables. List, tuple or dict.
The Var1 and Var2 in each pair must have the same Type.
Specific substitutions to make in the computation graph (Var2 replaces
Var1).
no_default_updates: either bool or list of Variables
If True, do not perform any automatic update on Variables. If False
(default), perform them all. Else, perform automatic updates on all
Variables that are neither in "updates" nor in "no_default_updates".
name : str
An optional name for this function. The profile mode will print the time
spent in this function.
rebuild_strict : bool
True (Default) is the safer and better tested setting, in which case
`givens` must substitute new variables with the same Type as the
variables they replace.
False is a you-better-know-what-you-are-doing setting, that permits
`givens` to replace variables with new variables of any Type.
The consequence of changing a Type is that all results depending on that
variable may have a different Type too (the graph is rebuilt from inputs
to outputs). If one of the new types does not make sense for one of the
Ops in the graph, an Exception will be raised.
allow_input_downcast: bool or None
True means that the values passed as inputs when calling the function
can be silently downcasted to fit the dtype of the corresponding
Variable, which may lose precision. False means that it will only be
cast to a more general, or precise, type. None (default) is almost like
False, but allows downcasting of Python float scalars to floatX.
profile: None, True, or ProfileStats instance
Accumulate profiling information into a given ProfileStats instance.
If argument is `True` then a new ProfileStats instance will be used.
This profiling object will be available via self.profile.
on_unused_input
What to do if a variable in the 'inputs' list is not used in the graph.
Possible values are 'raise', 'warn', 'ignore' and None.
Returns
-------
Function instance
A callable object that will compute the outputs (given the inputs) and
update the implicit function arguments according to the `updates`.
Notes
-----
Regarding givens: Be careful to make sure that these
substitutions are independent--behaviour when Var1 of one pair
appears in the graph leading to Var2 in another expression is
undefined. Replacements specified with givens are different
from optimizations in that Var2 is not expected to be
equivalent to Var1.
Internal documentation:
...
...
@@ -214,6 +206,7 @@ def function(inputs, outputs=None, mode=None, updates=None, givens=None,
was easier to develop the VM in Python then translate it to C instead
of just writing it in C from scratch.
CVM stands for C Virtual Machine.
"""
if
isinstance
(
outputs
,
dict
):
output_items
=
list
(
outputs
.
items
())
...
...
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