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uff_parser_enet.py
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uff_parser_enet.py
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import os, argparse
import tensorflow as tf
from tensorflow.python.framework import graph_util
import tensorrt as trt
from tensorrt.parsers import uffparser
import uff
## Usage: python uff_parser_enet.py --model_folder ./checkpoint
dir = os.path.dirname(os.path.realpath(__file__))
def freeze_graph(model_folder):
# We retrieve our checkpoint fullpath
checkpoint = tf.train.get_checkpoint_state(model_folder)
input_checkpoint = checkpoint.model_checkpoint_path
# the file fullname of our freezed graph
absolute_model_folder = "/".join(input_checkpoint.split('/')[:-1])
output_graph = absolute_model_folder + "/frozen_model.pb"
# Before exporting our graph, we need to define what is our output node
# This is how TF decides what part of the Graph has to be kept and what part it can dump
# NOTE: this variable is plural, because you can have multiple output nodes
output_node_names = "ENet/logits_to_softmax"
# We clear devices to allow TensorFlow to control on which device it will load operations
clear_devices = True
# We import the meta graph and retrieve a Saver
saver = tf.train.import_meta_graph(input_checkpoint + '.meta', clear_devices=clear_devices)
# We retrieve the protobuf graph definition
graph = tf.get_default_graph()
input_graph_def = graph.as_graph_def()
# We start a session and restore the graph weights
with tf.Session() as sess:
saver.restore(sess, input_checkpoint)
# We use a built-in TF helper to export variables to constants
output_graph_def = graph_util.convert_variables_to_constants(
sess, # The session is used to retrieve the weights
input_graph_def, # The graph_def is used to retrieve the nodes
output_node_names.split(",") # The output node names are used to select the usefull nodes
)
# Finally we serialize and dump the frozen output graph to the filesystem
with tf.gfile.GFile(output_graph, "wb") as f:
f.write(output_graph_def.SerializeToString())
print("%d ops in the final graph." % len(output_graph_def.node))
return tf.graph_util.remove_training_nodes(output_graph_def)
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument("--model_folder", type=str, help="Model folder to export")
args = parser.parse_args()
tf_model = freeze_graph(args.model_folder)
uff_model = uff.from_tensorflow(tf_model, ["ENet/logits_to_softmax"])