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# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Function for loading TensorFlow plugins."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import errno
import hashlib
import imp
import os
import platform
import sys
import threading # pylint: disable=unused-import
from tensorflow.core.framework import op_def_pb2
from tensorflow.core.lib.core import error_codes_pb2 # pylint: disable=unused-import
from tensorflow.python import pywrap_tensorflow as py_tf
from tensorflow.python.lib.io import file_io
from tensorflow.python.util import compat
from tensorflow.python.util.tf_export import tf_export
@tf_export('load_op_library')
def load_op_library(library_filename):
"""Loads a TensorFlow plugin, containing custom ops and kernels.
Pass "library_filename" to a platform-specific mechanism for dynamically
loading a library. The rules for determining the exact location of the
library are platform-specific and are not documented here. When the
library is loaded, ops and kernels registered in the library via the
`REGISTER_*` macros are made available in the TensorFlow process. Note
that ops with the same name as an existing op are rejected and not
registered with the process.
Args:
library_filename: Path to the plugin.
Relative or absolute filesystem path to a dynamic library file.
Returns:
A python module containing the Python wrappers for Ops defined in
the plugin.
Raises:
RuntimeError: when unable to load the library or get the python wrappers.
"""
lib_handle = py_tf.TF_LoadLibrary(library_filename)
op_list_str = py_tf.TF_GetOpList(lib_handle)
op_list = op_def_pb2.OpList()
op_list.ParseFromString(compat.as_bytes(op_list_str))
wrappers = py_tf.GetPythonWrappers(op_list_str)
# Delete the library handle to release any memory held in C
# that are no longer needed.
py_tf.TF_DeleteLibraryHandle(lib_handle)
# Get a unique name for the module.
module_name = hashlib.md5(wrappers).hexdigest()
if module_name in sys.modules:
return sys.modules[module_name]
module = imp.new_module(module_name)
# pylint: disable=exec-used
exec(wrappers, module.__dict__)
# Stash away the library handle for making calls into the dynamic library.
module.LIB_HANDLE = lib_handle
# OpDefs of the list of ops defined in the library.
module.OP_LIST = op_list
sys.modules[module_name] = module
return module
@tf_export('load_file_system_library')
def load_file_system_library(library_filename):
"""Loads a TensorFlow plugin, containing file system implementation.
Pass `library_filename` to a platform-specific mechanism for dynamically
loading a library. The rules for determining the exact location of the
library are platform-specific and are not documented here.
Args:
library_filename: Path to the plugin.
Relative or absolute filesystem path to a dynamic library file.
Returns:
None.
Raises:
RuntimeError: when unable to load the library.
"""
py_tf.TF_LoadLibrary(library_filename)
def _is_shared_object(filename):
"""Check the file to see if it is a shared object, only using extension."""
if platform.system() == 'Linux':
if filename.endswith('.so'):
return True
else:
index = filename.rfind('.so.')
if index == -1:
return False
else:
# A shared object with the API version in filename
return filename[index + 4].isdecimal()
elif platform.system() == 'Darwin':
return filename.endswith('.dylib')
elif platform.system() == 'Windows':
return filename.endswith('.dll')
else:
return False
@tf_export('load_library')
def load_library(library_location):
"""Loads a TensorFlow plugin.
"library_location" can be a path to a specific shared object, or a folder.
If it is a folder, all sahred objects that are named "libtfkernel*" will be
loaded. When the library is loaded, kernels registered in the library via the
`REGISTER_*` macros are made available in the TensorFlow process.
Args:
library_location: Path to the plugin or the folder of plugins.
Relative or absolute filesystem path to a dynamic library file or folder.
Returns:
None
Raises:
OSError: When the file to be loaded is not found.
RuntimeError: when unable to load the library.
"""
if file_io.file_exists(library_location):
if file_io.is_directory(library_location):
directory_contents = file_io.list_directory(library_location)
kernel_libraries = [
os.path.join(library_location, f) for f in directory_contents
if _is_shared_object(f)]
else:
kernel_libraries = [library_location]
for lib in kernel_libraries:
py_tf.TF_LoadLibrary(lib)
else:
raise OSError(
errno.ENOENT,
'The file or folder to load kernel libraries from does not exist.',
library_location)
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