def constfold(self, graphdef, output_names):
from tensorflow.core.protobuf import (config_pb2, meta_graph_pb2,
rewriter_config_pb2)
from tensorflow.python.framework import importer, ops
from tensorflow.python.grappler import tf_optimizer
from tensorflow.python.training import saver
graph = ops.Graph()
with graph.as_default():
output_collection = meta_graph_pb2.CollectionDef()
output_list = output_collection.node_list.value
for output in output_names:
output_list.append(output.encode("utf-8"))
importer.import_graph_def(graphdef, name="")
metagraph = saver.export_meta_graph(
graph_def=graph.as_graph_def(add_shapes=True), graph=graph)
metagraph.collection_def["train_op"].CopyFrom(output_collection)
rewriter_config = rewriter_config_pb2.RewriterConfig()
rewriter_config.optimizers.extend(["constfold"])
rewriter_config.meta_optimizer_iterations = (
rewriter_config_pb2.RewriterConfig.ONE)
session_config = config_pb2.ConfigProto()
session_config.graph_options.resave_options.CopyFrom(rewriter_config)
return tf_optimizer.OptimizeGraph(session_config,
metagraph,
graph_id=b"graph")
def do_transformation(self):
try:
g = tf.Graph()
with g.as_default():
g = tf.compat.v1.import_graph_def(self.model, name='')
meta_graph = saver.export_meta_graph(graph_def=self.model,
graph=g,
clear_devices=True)
fetch_collection = meta_graph_pb2.CollectionDef()
for fetch in self.outputs:
fetch_collection.node_list.value.append(fetch)
meta_graph.collection_def["train_op"].CopyFrom(
fetch_collection)
config = config_pb2.ConfigProto()
rewriter_config = config.graph_options.rewrite_options
for optimizer in self.generic_optimizer:
if optimizer in self.opt_cfg and self.opt_cfg[optimizer]:
rewriter_config.optimizers.append(optimizer)
if tf.version.VERSION >= '2.3.0':
for optimizer in self.tf_2_optimizer:
if optimizer in self.opt_cfg and self.opt_cfg[
optimizer]:
rewriter_config.optimizers.append(optimizer)
rewriter_config.min_graph_nodes = -1
optimized_graph = tf_optimizer.OptimizeGraph(
config, meta_graph)
return optimized_graph
except Exception as e:
self.logger.warning("Failed to run grappler pass due to {}".format(
str(e)))
return self.model
def get_metagraph():
"""Constructs and returns a MetaGraphDef from the input file."""
if FLAGS.metagraphdef:
with gfile.GFile(FLAGS.metagraphdef) as meta_file:
metagraph = meta_graph_pb2.MetaGraphDef()
if FLAGS.metagraphdef.endswith(".pbtxt"):
text_format.Merge(meta_file.read(), metagraph)
else:
metagraph.ParseFromString(meta_file.read())
if FLAGS.fetch is not None:
fetch_collection = meta_graph_pb2.CollectionDef()
for fetch in FLAGS.fetch.split(","):
fetch_collection.node_list.value.append(fetch)
metagraph.collection_def["train_op"].CopyFrom(fetch_collection)
else:
with gfile.GFile(FLAGS.graphdef) as graph_file:
graph_def = graph_pb2.GraphDef()
if FLAGS.graphdef.endswith(".pbtxt"):
text_format.Merge(graph_file.read(), graph_def)
else:
graph_def.ParseFromString(graph_file.read())
importer.import_graph_def(graph_def, name="")
graph = ops.get_default_graph()
for fetch in FLAGS.fetch.split(","):
fetch_op = graph.get_operation_by_name(fetch)
graph.add_to_collection("train_op", fetch_op)
metagraph = saver.export_meta_graph(graph_def=graph.as_graph_def(),
graph=graph)
return metagraph
def _convert_saved_model_v2(self):
"""Convert the input SavedModel in 2.0 format."""
assert context.executing_eagerly()
self._saved_model = load.load(self._input_saved_model_dir,
self._input_saved_model_tags)
func = self._saved_model.signatures[
self._input_saved_model_signature_key]
frozen_func = convert_to_constants.convert_variables_to_constants_v2(
func)
self._grappler_meta_graph_def = saver.export_meta_graph(
graph_def=frozen_func.graph.as_graph_def(),
graph=frozen_func.graph)
# Add a collection 'train_op' so that Grappler knows the outputs.
fetch_collection = meta_graph_pb2.CollectionDef()
for array in frozen_func.inputs + frozen_func.outputs:
fetch_collection.node_list.value.append(array.name)
self._grappler_meta_graph_def.collection_def["train_op"].CopyFrom(
fetch_collection)
# Run TRT optimizer in Grappler to convert the graph.
self._run_conversion()
self._converted_func = wrap_function.function_from_graph_def(
self._converted_graph_def,
[tensor.name for tensor in frozen_func.inputs],
[tensor.name for tensor in frozen_func.outputs])
def _run_inline_graph_optimization(func):
"""Apply function inline optimization to the graph.
Returns the GraphDef after Grappler's function inlining optimization is
applied. This optimization does not work on models with control flow.
Args:
func: ConcreteFunction.
Returns:
GraphDef
"""
meta_graph = export_meta_graph(
graph_def=func.graph.as_graph_def(), graph=func.graph)
# Add a collection 'train_op' so that Grappler knows the outputs.
fetch_collection = meta_graph_pb2.CollectionDef()
for array in func.inputs + func.outputs:
fetch_collection.node_list.value.append(array.name)
meta_graph.collection_def["train_op"].CopyFrom(fetch_collection)
# Initialize RewriterConfig with everything disabled except function inlining.
config = config_pb2.ConfigProto()
rewrite_options = config.graph_options.rewrite_options
rewrite_options.optimizers.append("function")
return tf_optimizer.OptimizeGraph(config, meta_graph)
def run_graph_optimizations(graph_def,
input_arrays,
output_arrays,
config,
graph=None):
"""Apply standard TensorFlow optimizations to the graph_def.
Args:
graph_def: Frozen GraphDef to be optimized.
input_arrays: List of arrays that are considered inputs of the graph.
output_arrays: List of arrays that are considered outputs of the graph.
config: tf.ConfigProto.
graph: TensorFlow Graph. Required when Eager mode is enabled. (default None)
Returns:
A new, optimized GraphDef.
"""
meta_graph = _export_meta_graph(graph_def=graph_def, graph=graph)
# We need to add a collection called 'train_op' so that grappler
# knows what the outputs are.
fetch_collection = _meta_graph_pb2.CollectionDef()
for array in input_arrays + output_arrays:
fetch_collection.node_list.value.append(array.name)
meta_graph.collection_def["train_op"].CopyFrom(fetch_collection)
return tf_optimizer.OptimizeGraph(config, meta_graph)
def run_ngraph_grappler_optimizer(input_gdef, output_nodes, ng_backend,
device_id, backend_optional_params,
shape_hints, do_aot):
graph = tf.Graph()
with graph.as_default():
tf.import_graph_def(input_gdef, name="")
grappler_meta_graph_def = tf.train.export_meta_graph(
graph_def=graph.as_graph_def(add_shapes=True), graph=graph)
_to_bytes = lambda s: s.encode("utf-8", errors="surrogateescape")
output_collection = meta_graph_pb2.CollectionDef()
output_list = output_collection.node_list.value
for i in output_nodes:
if isinstance(i, tf.Tensor):
output_list.append(_to_bytes(i.name))
else:
output_list.append(_to_bytes(i))
# TODO(laigd): use another key as the outputs are really not train_op.
grappler_meta_graph_def.collection_def["train_op"].CopyFrom(
output_collection)
session_config = tf.ConfigProto()
# Pass backend and backend_optional_params to grappler through rewriter config by updating the config
# TODO: move update_config_to_include_custom_config to ngraph_bridge
session_config = update_config_to_include_custom_config(
session_config, ng_backend, device_id, backend_optional_params,
shape_hints, do_aot)
try:
output_gdef = tf_optimizer.OptimizeGraph(
session_config, grappler_meta_graph_def, graph_id=b"tf_graph")
except Exception as e:
exit_on_error(False, e.message)
return output_gdef
def _run_graph_optimizations(graph_def,
input_arrays,
output_arrays,
graph=None):
"""Apply standard TensorFlow optimizations to the graph_def.
Args:
graph_def: Frozen GraphDef to be optimized.
input_arrays: List of arrays that are considered inputs of the graph.
output_arrays: List of arrays that are considered outputs of the graph.
graph: TensorFlow Graph. Required when Eager mode is enabled. (default None)
Returns:
A new, optimized GraphDef.
"""
meta_graph = _export_meta_graph(graph_def=graph_def, graph=graph)
# We need to add a collection called 'train_op' so that grappler
# knows what the outputs are.
fetch_collection = _meta_graph_pb2.CollectionDef()
for array in input_arrays + output_arrays:
fetch_collection.node_list.value.append(array.name)
meta_graph.collection_def["train_op"].CopyFrom(fetch_collection)
config = _config_pb2.ConfigProto()
rewrite_options = config.graph_options.rewrite_options
rewrite_options.layout_optimizer = _rewriter_config_pb2.RewriterConfig.ON
# Avoid remapping as it creates ops like _FusedConv2D, which are not
# supported by TF Lite.
rewrite_options.remapping = _rewriter_config_pb2.RewriterConfig.OFF
return _tf_optimizer.OptimizeGraph(config, meta_graph)
def optimize_graph(func,
output_graph,
tf_version,
quantization_dtype=None,
skip_op_check=False,
strip_debug_ops=False,
graph=None):
"""Takes a Python Graph object and optimizes the graph.
Args:
func: ConcreteFunction TensorFlow function def.
tf_version: Tensorflow version of the input graph.
quantization_dtype: An optional numpy dtype to quantize weights to for
compression. Only np.uint8 and np.uint16 are supported.
skip_op_check: Bool whether to skip the op check.
strip_debug_ops: Bool whether to strip debug ops.
graph_def: tf.GraphDef TensorFlow GraphDef proto object, which represents
the model topology.
"""
if graph is None:
graph = func.graph
graph_def = graph.as_graph_def()
unsupported = validate(graph_def.node, skip_op_check,
strip_debug_ops)
if unsupported:
raise ValueError('Unsupported Ops in the model before optimization\n' +
', '.join(unsupported))
config = config_pb2.ConfigProto()
rewriter_config = config.graph_options.rewrite_options
rewriter_config.optimizers[:] = [
'pruning', 'constfold', 'arithmetic', 'dependency', 'pruning', 'remap',
'constfold', 'arithmetic', 'dependency'
]
if strip_debug_ops:
rewriter_config.optimizers.insert(0, 'debug_stripper')
meta_graph = export_meta_graph(
graph_def=graph_def, graph=graph)
# Add a collection 'train_op' so that Grappler knows the outputs.
fetch_collection = meta_graph_pb2.CollectionDef()
if func is not None:
for array in func.inputs + func.outputs:
fetch_collection.node_list.value.append(array.name)
meta_graph.collection_def["train_op"].CopyFrom(fetch_collection)
optimized_graph = tf_optimizer.OptimizeGraph(
config, meta_graph, cluster=get_cluster())
unsupported = validate(optimized_graph.node, skip_op_check,
strip_debug_ops)
if unsupported:
raise ValueError('Unsupported Ops in the model after optimization\n' +
', '.join(unsupported))
extract_weights(
optimized_graph, output_graph, tf_version, quantization_dtype,
skip_op_check)
return optimize_graph
def do_transformation(self):
convert = False
for node in self.model.node:
if 'Conv' in node.op and \
'data_format' in node.attr and \
node.attr['data_format'].s == b'NCHW':
convert = True
break
if convert:
assert tf.version.VERSION >= '2.4.0', 'layout convert is only supported by \
tensorflow 2.4.0 and above'
g = tf.Graph()
with g.as_default(): # pylint: disable=not-context-manager
g = tf.compat.v1.import_graph_def(self.model, name='')
meta_graph = saver_lib.export_meta_graph(graph_def=self.model,
graph=g,
clear_devices=True)
fetch_collection = meta_graph_pb2.CollectionDef()
for fetch in self.outputs:
fetch_collection.node_list.value.append(fetch) # pylint: disable=no-member
meta_graph.collection_def["train_op"].CopyFrom( # pylint: disable=no-member
fetch_collection) # pylint: disable=no-member
config = config_pb2.ConfigProto()
convert = rewriter_config_pb2.RewriterConfig.NCHW_TO_NHWC # pylint: disable=no-member
config.graph_options.rewrite_options.CopyFrom( # pylint: disable=no-member
rewriter_config_pb2.RewriterConfig(
cpu_layout_conversion=convert))
optimized_graph = tf_optimizer.OptimizeGraph(config, meta_graph)
return optimized_graph
else:
return self.model
def run_ngraph_grappler_optimizer(input_gdef, output_nodes):
graph = tf.Graph()
with graph.as_default():
tf.import_graph_def(input_gdef, name="")
grappler_meta_graph_def = tf.train.export_meta_graph(
graph_def=graph.as_graph_def(add_shapes=True), graph=graph)
_to_bytes = lambda s: s.encode("utf-8", errors="surrogateescape")
output_collection = meta_graph_pb2.CollectionDef()
output_list = output_collection.node_list.value
for i in output_nodes:
if isinstance(i, tf.Tensor):
output_list.append(_to_bytes(i.name))
else:
output_list.append(_to_bytes(i))
# TODO(laigd): use another key as the outputs are really not train_op.
grappler_meta_graph_def.collection_def["train_op"].CopyFrom(
output_collection)
session_config_with_trt = tf.ConfigProto()
session_config_with_trt = ngraph_bridge.update_config(
session_config_with_trt)
output_gdef = tf_optimizer.OptimizeGraph(session_config_with_trt,
grappler_meta_graph_def,
graph_id=b"tf_graph")
return output_gdef
def do_transformation(self):
try:
g = tf.Graph()
with g.as_default():
g = tf.compat.v1.import_graph_def(self.model, name='')
meta_graph = saver.export_meta_graph(graph_def=self.model,
graph=g,
clear_devices=True)
fetch_collection = meta_graph_pb2.CollectionDef()
for fetch in self.outputs:
fetch_collection.node_list.value.append(fetch)
meta_graph.collection_def["train_op"].CopyFrom(
fetch_collection)
config = config_pb2.ConfigProto()
rewriter_config = config.graph_options.rewrite_options
rewriter_config.optimizers.append('pruning')
rewriter_config.optimizers.append('dependency')
rewriter_config.optimizers.append('debug_stripper')
rewriter_config.optimizers.append('loop')
rewriter_config.min_graph_nodes = -1
optimized_graph = tf_optimizer.OptimizeGraph(
config, meta_graph)
return optimized_graph
except Exception as e:
self.logger.warning("Failed to run grappler pass due to {}".format(
str(e)))
return self.model
def _run_inline_graph_optimization(func, lower_control_flow):
"""Apply function inline optimization to the graph.
Returns the GraphDef after Grappler's function inlining optimization is
applied. This optimization does not work on models with control flow.
Args:
func: ConcreteFunction.
lower_control_flow: Boolean indicating whether or not to lower control flow
ops such as If and While. (default True)
Returns:
GraphDef
"""
graph_def = func.graph.as_graph_def()
if not lower_control_flow:
graph_def = disable_lower_using_switch_merge(graph_def)
# In some cases, a secondary implementation of the function (e.g. for GPU) is
# written to the "api_implements" attribute. (e.g. `tf.keras.layers.LSTM` in
# TF2 produces a CuDNN-based RNN for GPU).
# This function suppose to inline all functions calls, but "api_implements"
# prevents this from happening. Removing the attribute solves the problem.
# To learn more about "api_implements", see:
# tensorflow/core/grappler/optimizers/implementation_selector.h
for function in graph_def.library.function:
if "api_implements" in function.attr:
del function.attr["api_implements"]
meta_graph = export_meta_graph(graph_def=graph_def, graph=func.graph)
# Clear the initializer_name for the variables collections, since they are not
# needed after saved to saved_model.
for name in [
"variables", "model_variables", "trainable_variables",
"local_variables"
]:
raw_list = []
for raw in meta_graph.collection_def["variables"].bytes_list.value:
variable = variable_pb2.VariableDef()
variable.ParseFromString(raw)
variable.ClearField("initializer_name")
raw_list.append(variable.SerializeToString())
meta_graph.collection_def[name].bytes_list.value[:] = raw_list
# Add a collection 'train_op' so that Grappler knows the outputs.
fetch_collection = meta_graph_pb2.CollectionDef()
for array in func.inputs + func.outputs:
fetch_collection.node_list.value.append(array.name)
meta_graph.collection_def["train_op"].CopyFrom(fetch_collection)
# Initialize RewriterConfig with everything disabled except function inlining.
config = config_pb2.ConfigProto()
rewrite_options = config.graph_options.rewrite_options
rewrite_options.min_graph_nodes = -1 # do not skip small graphs
rewrite_options.optimizers.append("function")
return tf_optimizer.OptimizeGraph(config, meta_graph)
def _convert_saved_model_v2(self):
"""Convert the input SavedModel in 2.0 format."""
self._saved_model = load.load(self._input_saved_model_dir,
self._input_saved_model_tags)
func = self._saved_model.signatures[
self._input_saved_model_signature_key]
frozen_func = convert_to_constants.convert_variables_to_constants_v2(
func)
self._grappler_meta_graph_def = saver.export_meta_graph(
graph_def=frozen_func.graph.as_graph_def(),
graph=frozen_func.graph)
# Add a collection 'train_op' so that Grappler knows the outputs.
fetch_collection = meta_graph_pb2.CollectionDef()
for array in func.inputs + func.outputs:
fetch_collection.node_list.value.append(array.name)
self._grappler_meta_graph_def.collection_def["train_op"].CopyFrom(
fetch_collection)
# Run TRT optimizer in Grappler to convert the graph.
self._run_conversion()
def _get_tensor(graph, tensors):
new_tensors = []
for tensor in tensors:
new_tensor = graph.get_tensor_by_name(tensor.name)
new_tensor.set_shape(tensor.shape)
new_tensors.append(new_tensor)
return new_tensors
# TODO(laigd): do we need to use different name e.g. "trt_func_graph"?
converted_graph = func_graph.FuncGraph(func.graph.name)
with converted_graph.as_default():
importer.import_graph_def(self._converted_graph_def, name="")
converted_graph.inputs = _get_tensor(converted_graph,
func.graph.inputs)
converted_graph.outputs = _get_tensor(converted_graph,
func.graph.outputs)
converted_graph.structured_outputs = func.graph.structured_outputs
converted_graph.structured_input_signature = (
func.graph.structured_input_signature)
# pylint: disable=protected-access
# TODO(laigd): should we set up the signature as well?
self._converted_func = function.ConcreteFunction(converted_graph,
attrs=None,
signature=None)
self._converted_func.add_to_graph()
self._converted_func._arg_keywords = func._arg_keywords
self._converted_func._num_positional_args = func._num_positional_args
self._converted_func._captured_inputs = func._captured_inputs
self._converted_func.graph.variables = func.graph.variables
def _inline_functions(self, graph_def, arrays):
meta_graph = export_meta_graph(graph_def=graph_def)
fetch_collection = meta_graph_pb2.CollectionDef()
for name in arrays:
fetch_collection.node_list.value.append(name)
meta_graph.collection_def["train_op"].CopyFrom(fetch_collection)
# Initialize RewriterConfig with everything disabled except function
# inlining.
config = tf.compat.v1.ConfigProto()
rewrite_options = config.graph_options.rewrite_options
rewrite_options.optimizers.append("function")
return tf_optimizer.OptimizeGraph(config, meta_graph)
def _optimize_graph(meta_graph_def, signature_def):
"""Optimize `meta_graph_def` using grappler. Returns a `GraphDef`."""
# We need to add a collection called 'train_op' so that grappler
# knows what the outputs are.
new_meta_graph_def = copy.deepcopy(meta_graph_def)
fetch_collection = meta_graph_pb2.CollectionDef()
for tensor_info in (list(signature_def.inputs.values()) +
list(signature_def.outputs.values())):
fetch_collection.node_list.value.append(tensor_info.name)
new_meta_graph_def.collection_def['train_op'].CopyFrom(fetch_collection)
config = config_pb2.ConfigProto()
return tf_optimizer.OptimizeGraph(config, new_meta_graph_def)
def tf_optimize_grappler(input_names, output_names, graph_def):
config = config_pb2.ConfigProto()
rewrite_options = config.graph_options.rewrite_options
config.graph_options.infer_shapes = True
rewrite_options.optimizers[:] = [
'pruning', 'constfold', 'arithmetic', 'dependency', 'function',
]
meta_graph = tf.compat.v1.train.export_meta_graph(graph_def=graph_def)
fetch_collection = meta_graph_pb2.CollectionDef()
for t in input_names + output_names:
fetch_collection.node_list.value.append(t)
meta_graph.collection_def['train_op'].CopyFrom(fetch_collection)
graph_def = tf_optimizer.OptimizeGraph(config, meta_graph)
return graph_def
def convert(self):
"""Convert the input SavedModel in 2.0 format.
Returns:
The TF-TRT converted Function.
"""
assert not self._converted
self._saved_model = load.load(self._input_saved_model_dir,
self._input_saved_model_tags)
func = self._saved_model.signatures[
self._input_saved_model_signature_key]
frozen_func = convert_to_constants.convert_variables_to_constants_v2(
func)
grappler_meta_graph_def = saver.export_meta_graph(
graph_def=frozen_func.graph.as_graph_def(),
graph=frozen_func.graph)
# Add a collection 'train_op' so that Grappler knows the outputs.
fetch_collection = meta_graph_pb2.CollectionDef()
for array in frozen_func.inputs + frozen_func.outputs:
fetch_collection.node_list.value.append(array.name)
grappler_meta_graph_def.collection_def["train_op"].CopyFrom(
fetch_collection)
# Run TRT optimizer in Grappler to convert the graph.
self._converted_graph_def = self._run_conversion(
grappler_meta_graph_def)
self._converted_func = wrap_function.function_from_graph_def(
self._converted_graph_def,
[tensor.name for tensor in frozen_func.inputs],
[tensor.name for tensor in frozen_func.outputs])
# Reconstruct the output signatures using the ones from original model.
self._converted_func.graph.structured_outputs = nest.pack_sequence_as(
func.graph.structured_outputs,
self._converted_func.graph.structured_outputs)
self._converted = True
# Wrap the converted ConcreteFunction in a Function so it can accept numpy
# arrays as input.
@def_function.function
def wrapper_func(*args, **kwargs):
return self._converted_func(*args, **kwargs)
return wrapper_func
def _run_inline_graph_optimization(func, lower_control_flow):
"""Apply function inline optimization to the graph.
Returns the GraphDef after Grappler's function inlining optimization is
applied. This optimization does not work on models with control flow.
Args:
func: ConcreteFunction.
lower_control_flow: Boolean indicating whether or not to lower control flow
ops such as If and While. (default True)
Returns:
GraphDef
"""
graph_def = func.graph.as_graph_def()
if not lower_control_flow:
graph_def = disable_lower_using_switch_merge(graph_def)
meta_graph = export_meta_graph(graph_def=graph_def, graph=func.graph)
# Clear the initializer_name for the variables collections, since they are not
# needed after saved to saved_model.
for name in [
"variables", "model_variables", "trainable_variables",
"local_variables"
]:
raw_list = []
for raw in meta_graph.collection_def["variables"].bytes_list.value:
variable = variable_pb2.VariableDef()
variable.ParseFromString(raw)
variable.ClearField("initializer_name")
raw_list.append(variable.SerializeToString())
meta_graph.collection_def[name].bytes_list.value[:] = raw_list
# Add a collection 'train_op' so that Grappler knows the outputs.
fetch_collection = meta_graph_pb2.CollectionDef()
for array in func.inputs + func.outputs:
fetch_collection.node_list.value.append(array.name)
meta_graph.collection_def["train_op"].CopyFrom(fetch_collection)
# Initialize RewriterConfig with everything disabled except function inlining.
config = config_pb2.ConfigProto()
rewrite_options = config.graph_options.rewrite_options
rewrite_options.min_graph_nodes = -1 # do not skip small graphs
rewrite_options.optimizers.append("function")
return tf_optimizer.OptimizeGraph(config, meta_graph)
def _test_convert_variables_with_functions(self, inline_functions):
"""Freezes a graph with functions."""
@function.Defun(dtypes.float32)
def plus_one(x):
return x + 1.0
with ops.Graph().as_default():
variable_node = variables.Variable(1.0, name="variable_node")
_ = variables.Variable(1.0, name="unused_variable_node")
defun_node = plus_one(variable_node)
_ = math_ops_lib.multiply(defun_node, 2.0, name="output_node")
with session.Session() as sess:
self.evaluate(variables.variables_initializer([variable_node]))
variable_graph_def = sess.graph.as_graph_def()
if inline_functions:
# Run Grappler to create the VarOpHandle --> Placeholder -->
# ResourceVariable pattern.
meta_graph = export_meta_graph(
graph_def=variable_graph_def)
fetch_collection = meta_graph_pb2.CollectionDef()
for name in ["variable_node", "output_node"]:
fetch_collection.node_list.value.append(name)
meta_graph.collection_def["train_op"].CopyFrom(
fetch_collection)
# Initialize RewriterConfig with everything disabled except function
# inlining.
config = config_pb2.ConfigProto()
rewrite_options = config.graph_options.rewrite_options
rewrite_options.optimizers.append("function")
variable_graph_def = tf_optimizer.OptimizeGraph(
config, meta_graph)
constant_graph_def = graph_util.convert_variables_to_constants(
sess, variable_graph_def, ["output_node"])
# Ensure there are no variables after freezing.
for node in constant_graph_def.node:
self.assertNotIn(
node.op,
["Variable", "VariableV2", "VarHandleOp", "ReadVariableOp"])
def constfold(graphdef, output_name):
graph = ops.Graph()
with graph.as_default():
outputs = output_name.split(',')
output_collection = meta_graph_pb2.CollectionDef()
output_list = output_collection.node_list.value
for output in outputs:
output_list.append(output)
importer.import_graph_def(graphdef, name="")
metagraph = saver.export_meta_graph(graph_def=graph.as_graph_def(add_shapes=True), graph=graph)
metagraph.collection_def["train_op"].CopyFrom(output_collection)
rewriter_config = rewriter_config_pb2.RewriterConfig()
rewriter_config.optimizers.extend(["constfold"])
rewriter_config.meta_optimizer_iterations = (rewriter_config_pb2.RewriterConfig.ONE)
session_config = config_pb2.ConfigProto()
session_config.graph_options.rewrite_options.CopyFrom(rewriter_config)
return tf_optimizer.OptimizeGraph(session_config, metagraph)
def tf_optimize_grappler(input_names, output_names, graph_def, fold_constant=None):
from tensorflow.core.protobuf import meta_graph_pb2 as meta_graph_pb2, config_pb2, rewriter_config_pb2
from tensorflow.python.grappler import tf_optimizer as tf_opt
config = config_pb2.ConfigProto()
rewrite_options = config.graph_options.rewrite_options
config.graph_options.infer_shapes = True
# TODO: if we turn on pruning, grappler removes some identities that the tf-1.x lstm rewriter
# depends on so for now don't turn this on.
rewrite_options.optimizers[:] = [
# 'pruning', 'constfold', 'arithmetic', 'dependency', 'function',
'constfold', 'function'
]
meta_graph = tf.compat.v1.train.export_meta_graph(graph_def=graph_def)
fetch_collection = meta_graph_pb2.CollectionDef()
for t in input_names + output_names:
fetch_collection.node_list.value.append(t)
meta_graph.collection_def["train_op"].CopyFrom(fetch_collection)
graph_def = tf_opt.OptimizeGraph(config, meta_graph)
return graph_def
def do_transformation(self):
convert = False
for node in self.model.node:
if 'Conv' in node.op and \
'data_format' in node.attr and \
node.attr['data_format'].s == b'NCHW':
convert = True
break
if convert and tf.version.VERSION >= '2.4.0':
g = tf.Graph()
with g.as_default(): # pylint: disable=not-context-manager
g = tf.compat.v1.import_graph_def(self.model, name='')
meta_graph = saver_lib.export_meta_graph(
graph_def=self.model, graph=g, clear_devices=True)
fetch_collection = meta_graph_pb2.CollectionDef()
for fetch in self.outputs:
fetch_collection.node_list.value.append(fetch) # pylint: disable=no-member
meta_graph.collection_def["train_op"].CopyFrom( # pylint: disable=no-member
fetch_collection) # pylint: disable=no-member
config = config_pb2.ConfigProto()
convert = rewriter_config_pb2.RewriterConfig.NCHW_TO_NHWC # pylint: disable=no-member
config.graph_options.rewrite_options.CopyFrom( # pylint: disable=no-member
rewriter_config_pb2.RewriterConfig(
disable_model_pruning=True,
constant_folding=rewriter_config_pb2.RewriterConfig.OFF,
dependency_optimization=rewriter_config_pb2.RewriterConfig.OFF,
memory_optimization=rewriter_config_pb2.RewriterConfig.NO_MEM_OPT,
arithmetic_optimization=rewriter_config_pb2.RewriterConfig.OFF,
shape_optimization=rewriter_config_pb2.RewriterConfig.OFF,
loop_optimization=rewriter_config_pb2.RewriterConfig.OFF,
function_optimization=rewriter_config_pb2.RewriterConfig.OFF,
remapping=rewriter_config_pb2.RewriterConfig.OFF,
implementation_selector=rewriter_config_pb2.RewriterConfig.OFF,
cpu_layout_conversion=convert))
optimized_graph = tf_optimizer.OptimizeGraph(config, meta_graph)
return optimized_graph
return self.model
def _convert_graph_def(self):
"""Convert the input GraphDef."""
graph = ops.Graph()
with graph.as_default():
importer.import_graph_def(self._input_graph_def, name="")
self._grappler_meta_graph_def = saver.export_meta_graph(
graph_def=graph.as_graph_def(add_shapes=True), graph=graph)
if self._nodes_blacklist:
output_collection = meta_graph_pb2.CollectionDef()
output_list = output_collection.node_list.value
for i in self._nodes_blacklist:
if isinstance(i, ops.Tensor):
output_list.append(_to_bytes(i.name))
else:
output_list.append(_to_bytes(i))
# TODO(laigd): use another key as the self._nodes_blacklist are really
# not train_op.
self._grappler_meta_graph_def.collection_def["train_op"].CopyFrom(
output_collection)
self._run_conversion()
def get_metagraph():
"""Constructs and returns a MetaGraphDef from the input file."""
with gfile.GFile(FLAGS.input) as input_file:
input_data = input_file.read()
try:
saved_model = saved_model_pb2.SavedModel()
text_format.Merge(input_data, saved_model)
meta_graph = saved_model.meta_graphs[0]
except text_format.ParseError:
try:
saved_model.ParseFromString(input_data)
meta_graph = saved_model.meta_graphs[0]
except message.DecodeError:
try:
meta_graph = meta_graph_pb2.MetaGraphDef()
text_format.Merge(input_data, meta_graph)
except text_format.ParseError:
try:
meta_graph.ParseFromString(input_data)
except message.DecodeError:
try:
graph_def = graph_pb2.GraphDef()
text_format.Merge(input_data, graph_def)
except text_format.ParseError:
try:
graph_def.ParseFromString(input_data)
except message.DecodeError:
raise ValueError(
f"Invalid input file: {FLAGS.input}.")
importer.import_graph_def(graph_def, name="")
graph = ops.get_default_graph()
meta_graph = saver.export_meta_graph(
graph_def=graph.as_graph_def(), graph=graph)
if FLAGS.fetch is not None:
fetch_collection = meta_graph_pb2.CollectionDef()
for fetch in FLAGS.fetch.split(","):
fetch_collection.node_list.value.append(fetch)
meta_graph.collection_def["train_op"].CopyFrom(fetch_collection)
return meta_graph
def _run_graph_optimizations(graph_def, output_arrays):
"""Apply standard TensorFlow optimizations to the graph_def.
Args:
graph_def: Frozen GraphDef to be optimized.
output_arrays: List of arrays that are considered outputs of the graph.
Returns:
A new, optimized GraphDef.
"""
meta_graph = _export_meta_graph(graph_def=graph_def)
# We need to add a collection called 'train_op' so that grappler
# knows what the outputs are.
fetch_collection = _meta_graph_pb2.CollectionDef()
for output in output_arrays:
fetch_collection.node_list.value.append(output)
meta_graph.collection_def["train_op"].CopyFrom(fetch_collection)
config = _config_pb2.ConfigProto()
rewrite_options = config.graph_options.rewrite_options
rewrite_options.layout_optimizer = _rewriter_config_pb2.RewriterConfig.ON
return _tf_optimizer.OptimizeGraph(config, meta_graph)
def main(_):
if FLAGS.metagraphdef:
with gfile.GFile(FLAGS.metagraphdef) as meta_file:
metagraph = meta_graph_pb2.MetaGraphDef()
if FLAGS.metagraphdef.endswith(".pbtxt"):
text_format.Merge(meta_file.read(), metagraph)
else:
metagraph.ParseFromString(meta_file.read())
if FLAGS.fetch is not None:
fetch_collection = meta_graph_pb2.CollectionDef()
fetch_collection.node_list.value.append(FLAGS.fetch)
metagraph.collection_def["train_op"].CopyFrom(fetch_collection)
else:
with gfile.GFile(FLAGS.graphdef) as graph_file:
graph_def = graph_pb2.GraphDef()
if FLAGS.graphdef.endswith(".pbtxt"):
text_format.Merge(graph_file.read(), graph_def)
else:
graph_def.ParseFromString(graph_file.read())
importer.import_graph_def(graph_def, name="")
graph = ops.get_default_graph()
fetch = graph.get_operation_by_name(FLAGS.fetch)
graph.add_to_collection("train_op", fetch)
metagraph = saver.export_meta_graph(graph_def=graph.as_graph_def(),
graph=graph)
rewriter_config = rewriter_config_pb2.RewriterConfig()
if FLAGS.rewriter_config is not None:
text_format.Merge(FLAGS.rewriter_config, rewriter_config)
optimized_graph = tf_optimizer.OptimizeGraph(rewriter_config, metagraph)
metagraph.graph_def.CopyFrom(optimized_graph)
report = cost_analyzer.GenerateCostReport(metagraph, FLAGS.per_node_report)
print(report)
report = cost_analyzer.GenerateMemoryReport(metagraph)
print(report)
with tf.Session(graph=g2) as sess:
tf.compat.v1.train.Saver().restore(sess, ckptFile)
constantGraph = tf.graph_util.convert_variables_to_constants(
sess, g2.as_graph_def(), [outputNodeName])
with tf.gfile.FastGFile(pbFile, mode='wb') as f:
f.write(constantGraph.SerializeToString())
print("Succeeded saving .pb in TensorFlow!")
# 优化 .pb ---------------------------------------------------------------------
with open(pbFile, 'rb') as f:
graphdef = graph_pb2.GraphDef()
graphdef.ParseFromString(f.read())
graph = ops.Graph()
with graph.as_default():
outputCollection = meta_graph_pb2.CollectionDef()
for output in outputNodeName.split(','):
outputCollection.node_list.value.append(output)
importer.import_graph_def(graphdef, name="")
metagraph = saver.export_meta_graph(
graph_def=graph.as_graph_def(add_shapes=True), graph=graph)
metagraph.collection_def["train_op"].CopyFrom(outputCollection)
rewriter_config = rewriter_config_pb2.RewriterConfig()
rewriter_config.optimizers.extend(["constfold"])
rewriter_config.meta_optimizer_iterations = (
rewriter_config_pb2.RewriterConfig.ONE)
session_config = config_pb2.ConfigProto()
session_config.graph_options.rewrite_options.CopyFrom(rewriter_config)
folded_graph = tf_optimizer.OptimizeGraph(session_config, metagraph)
def convert(self, calibration_input_fn=None):
"""Convert the input SavedModel in 2.0 format.
Args:
calibration_input_fn: a generator function that yields input data as a
list or tuple, which will be used to execute the converted signature for
calibration. All the returned input data should have the same shape.
Example:
```
def input_fn():
yield input1, input2, input3
```
Raises:
ValueError: if the input combination is invalid.
Returns:
The TF-TRT converted Function.
"""
assert not self._converted
if (self._need_calibration and not calibration_input_fn):
raise ValueError("Should specify calibration_input_fn because INT8 "
"calibration is needed")
if (not self._need_calibration and calibration_input_fn):
raise ValueError("Should not specify calibration_input_fn because INT8 "
"calibration is not needed")
self._saved_model = load.load(self._input_saved_model_dir,
self._input_saved_model_tags)
func = self._saved_model.signatures[self._input_saved_model_signature_key]
frozen_func = convert_to_constants.convert_variables_to_constants_v2(func)
grappler_meta_graph_def = saver.export_meta_graph(
graph_def=frozen_func.graph.as_graph_def(), graph=frozen_func.graph)
# Add a collection 'train_op' so that Grappler knows the outputs.
fetch_collection = meta_graph_pb2.CollectionDef()
for array in frozen_func.inputs + frozen_func.outputs:
fetch_collection.node_list.value.append(array.name)
grappler_meta_graph_def.collection_def["train_op"].CopyFrom(
fetch_collection)
# Run TRT optimizer in Grappler to convert the graph.
self._converted_graph_def = self._run_conversion(grappler_meta_graph_def)
self._converted_func = wrap_function.function_from_graph_def(
self._converted_graph_def,
[tensor.name for tensor in frozen_func.inputs],
[tensor.name for tensor in frozen_func.outputs])
# Reconstruct the output signatures using the ones from original model.
self._converted_func.graph.structured_outputs = nest.pack_sequence_as(
func.graph.structured_outputs,
self._converted_func.graph.structured_outputs)
if self._need_calibration:
for inp in calibration_input_fn():
self._converted_func(*map(ops.convert_to_tensor, inp))
def _save_calibration_table(node):
calibration_table = gen_trt_ops.get_calibration_data_op(
_get_canonical_engine_name(node.name))
node.attr["calibration_data"].s = calibration_table.numpy()
self._for_each_trt_node(self._converted_graph_def,
_save_calibration_table)
# Rebuild the function since calibration has changed the graph.
calibrated_func = wrap_function.function_from_graph_def(
self._converted_graph_def,
[tensor.name for tensor in self._converted_func.inputs],
[tensor.name for tensor in self._converted_func.outputs])
calibrated_func.graph.structured_outputs = nest.pack_sequence_as(
self._converted_func.graph.structured_outputs,
calibrated_func.graph.structured_outputs)
self._converted_func = calibrated_func
self._converted = True
def create_inference_graph(input_graph_def,
outputs,
max_batch_size=1,
max_workspace_size_bytes=2 << 20,
precision_mode="FP32",
minimum_segment_size=3,
is_dynamic_op=False,
maximum_cached_engines=1,
cached_engine_batches=None):
"""Python wrapper for the TRT transformation.
Args:
input_graph_def: GraphDef object containing a model to be transformed.
outputs: list of tensors or node names for the model outputs.
max_batch_size: max size for the input batch
max_workspace_size_bytes: parameter to control memory allocation (in Bytes)
precision_mode: one of 'FP32', 'FP16' and 'INT8'
minimum_segment_size: the minimum number of nodes required for a subgraph to
be replaced by TRTEngineOp.
is_dynamic_op: whether to generate dynamic TRT ops which will build the TRT
network and engine at run time.
maximum_cached_engines: max number of cached TRT engines in dynamic TRT ops.
cached_engine_batches: batch sizes used to pre-create cached engines.
Returns:
New GraphDef with TRTEngineOps placed in graph replacing subgraphs.
Raises:
ValueError: if the provided precision mode is invalid.
RuntimeError: if the returned status message is malformed.
"""
supported_precision_modes = {"FP32": 0, "FP16": 1, "INT8": 2}
if precision_mode.upper() not in supported_precision_modes:
raise ValueError(("precision mode '{}' is not supported."
"It should be one of {}").format(
precision_mode, "{'FP32', 'FP16', 'INT8'}"))
mode = supported_precision_modes[precision_mode.upper()]
compiled_version = get_linked_tensorrt_version()
loaded_version = get_loaded_tensorrt_version()
version_mismatch = False
if loaded_version[0] < compiled_version[0]:
tf_logging.error(
"TensorRT version mismatch. Tensorflow was compiled against " +
"TensorRT %s but library loaded from environment is TensorRT %s" %
(".".join([str(x) for x in compiled_version]),
".".join([str(x) for x in loaded_version])) +
". Please make sure that correct version of TensorRT " +
"is available in the system and added to ldconfig or LD_LIBRARY_PATH")
raise RuntimeError("Incompatible TensorRT library version")
for i in zip(loaded_version, compiled_version):
if i[0] != i[1]:
tf_logging.warn("TensorRT mismatch. Compiled against version " +
"%s, but loaded %s. Things may not work" %
(".".join([str(x) for x in compiled_version]),
".".join([str(x) for x in loaded_version])))
version_mismatch = True
break
if not version_mismatch:
tf_logging.info("Running against TensorRT version %s" % ".".join(
[str(x) for x in loaded_version]))
def py2bytes(inp):
return inp
def py3bytes(inp):
return inp.encode("utf-8", errors="surrogateescape")
def py2string(inp):
return inp
def py3string(inp):
return inp.decode("utf-8")
if _six.PY2:
to_bytes = py2bytes
to_string = py2string
else:
to_bytes = py3bytes
to_string = py3string
# Create MetaGraphDef
graph = ops.Graph()
with graph.as_default():
importer.import_graph_def(input_graph_def, name="")
meta_graph = saver.export_meta_graph(
graph_def=graph.as_graph_def(), graph=graph)
if outputs:
output_collection = meta_graph_pb2.CollectionDef()
output_list = output_collection.node_list.value
for i in outputs:
if isinstance(i, ops.Tensor):
output_list.append(to_bytes(i.name))
else:
output_list.append(to_bytes(i))
meta_graph.collection_def["train_op"].CopyFrom(output_collection)
# Create RewriterConfig.
rewriter_cfg = rewriter_config_pb2.RewriterConfig()
rewriter_cfg.optimizers.extend(["constfold", "layout"])
optimizer = rewriter_cfg.custom_optimizers.add()
optimizer.name = "TensorRTOptimizer"
optimizer.parameter_map["minimum_segment_size"].i = minimum_segment_size
optimizer.parameter_map["max_batch_size"].i = max_batch_size
optimizer.parameter_map["is_dynamic_op"].b = is_dynamic_op
optimizer.parameter_map[
"max_workspace_size_bytes"].i = max_workspace_size_bytes
optimizer.parameter_map["precision_mode"].s = to_bytes(precision_mode)
optimizer.parameter_map["maximum_cached_engines"].i = maximum_cached_engines
if cached_engine_batches:
if not isinstance(cached_engine_batches, list):
raise TypeError("cached_engine_batches should be a list.")
optimizer.parameter_map["cached_engine_batches"].list.i.extend(
cached_engine_batches)
return tf_optimizer.OptimizeGraph(
rewriter_cfg, meta_graph, graph_id=b"tf_graph")
