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diff --git a/tools/python/tf_sess_config.py b/tools/python/tf_sess_config.py
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+# Copyright (c) 2021
+#
+# This file is part of FFmpeg.
+#
+# FFmpeg is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# FFmpeg is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with FFmpeg; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+# ==============================================================================
+
+# verified with Python 3.6.8 on CentOS 7.2
+import tensorflow as tf
+
+visible_device_list = '0' # use , separator for more GPUs like '0, 1'
+per_process_gpu_memory_fraction = 0.9 # avoid out of memory
+intra_op_parallelism_threads = 2 # default in tensorflow
+inter_op_parallelism_threads = 5 # default in tensorflow
+
+gpu_options = tf.compat.v1.GPUOptions(
+ per_process_gpu_memory_fraction = per_process_gpu_memory_fraction,
+ visible_device_list = visible_device_list,
+ allow_growth = True)
+
+config = tf.compat.v1.ConfigProto(
+ allow_soft_placement = True,
+ log_device_placement = False,
+ intra_op_parallelism_threads = intra_op_parallelism_threads,
+ inter_op_parallelism_threads = inter_op_parallelism_threads,
+ gpu_options = gpu_options)
+
+s = config.SerializeToString()
+# print(list(map(hex, s))) # print by json if need
+
+print('a serialized protobuf string for TF_SetConfig, note the byte order is in normal order.')
+b = ''.join(format(b,'02x') for b in s)
+print('0x%s' % b) # print by hex format