amir-abdi/keras_to_tensorflow
![amir-abdi/keras_to_tensorflow](/images/project/repo-9_hu6247f95981f150efef2a9e012ffd533e_35117_900x500_fit_q75_box.jpg)
General code to convert a trained keras model into an inference tensorflow model
repo name | amir-abdi/keras_to_tensorflow |
repo link | https://github.com/amir-abdi/keras_to_tensorflow |
homepage | |
language | Python |
size (curr.) | 148 kB |
stars (curr.) | 1331 |
created | 2017-05-10 |
license | MIT License |
Keras to TensorFlow
The keras_to_tensorflow is a tool that converts a trained keras model into a ready-for-inference TensorFlow model. The tool is NOT tailored for TensorFlow 2.0 it SEEMS to be working fine.
Summary
-
In the default behaviour, this tool freezes the nodes (converts all TF variables to TF constants), and saves the inference graph and weights into a binary protobuf (.pb) file. During freezing, TensorFlow also applies node pruning which removes nodes with no contribution to the output tensor.
-
This tool supports multiple output networks and enables the user to rename the output tensors via the
--output_nodes_prefix
flag. -
If the
--output_meta_ckpt
flag is set, the checkpoint and metagraph files for TensorFlow will also be exported which can later be used in thetf.train.Saver
class to continue training.
How to use
Keras models can be saved as a single [.hdf5
or h5
] file, which stores both the architecture and weights, using the model.save()
function.
This model can be then converted to a TensorFlow model by calling this tool as follows:
python keras_to_tensorflow.py
--input_model="path/to/keras/model.h5"
--output_model="path/to/save/model.pb"
Keras models can also be saved in two separate files where a [.hdf5
or h5
] file stores the weights, using the model.save_weights()
function, and another .json
file stores the network architecture using the model.to_json()
function.
In this case, the model can be converted as follows:
python keras_to_tensorflow.py
--input_model="path/to/keras/model.h5"
--input_model_json="path/to/keras/model.json"
--output_model="path/to/save/model.pb"
Try
python keras_to_tensorflow.py --help
to learn about other supported flags (quantize, output_nodes_prefix, save_graph_def).
Dependencies
- keras
- tensorflow
- absl
- pathlib
Legacy code
The code on how to freeze and save keras models in previous versions of tensorflow is also available. Back then, the freeze_graph tool (/tensorflow/python/tools/freeze_graph.py
) was used to convert the variables into constants. This functionality is now handled by graph_util.convert_variables_to_constants