| # Copyright (c) 2021 Arm Limited. All rights reserved. |
| # SPDX-License-Identifier: Apache-2.0 |
| # |
| # 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. |
| |
| """ |
| Utility script to generate model c file that can be included in the |
| project directly. This should be called as part of cmake framework |
| should the models need to be generated at configuration stage. |
| """ |
| import datetime |
| import os |
| from argparse import ArgumentParser |
| from pathlib import Path |
| from jinja2 import Environment, FileSystemLoader |
| import binascii |
| |
| parser = ArgumentParser() |
| |
| parser.add_argument("--tflite_path", help="Model (.tflite) path", required=True) |
| parser.add_argument("--output_dir", help="Output directory", required=True) |
| parser.add_argument('-e', '--expression', action='append', default=[], dest="expr") |
| parser.add_argument('--header', action='append', default=[], dest="headers") |
| parser.add_argument('-ns', '--namespaces', action='append', default=[], dest="namespaces") |
| parser.add_argument("--license_template", type=str, help="Header template file", |
| default="header_template.txt") |
| args = parser.parse_args() |
| |
| env = Environment(loader=FileSystemLoader(os.path.join(os.path.dirname(__file__), 'templates')), |
| trim_blocks=True, |
| lstrip_blocks=True) |
| |
| |
| def get_tflite_data(tflite_path: str) -> list: |
| """ |
| Reads a binary file and returns a C style array as a |
| list of strings. |
| |
| Argument: |
| tflite_path: path to the tflite model. |
| |
| Returns: |
| list of strings |
| """ |
| with open(tflite_path, 'rb') as tflite_model: |
| data = tflite_model.read() |
| |
| bytes_per_line = 32 |
| hex_digits_per_line = bytes_per_line * 2 |
| hexstream = binascii.hexlify(data).decode('utf-8') |
| hexstring = '{' |
| |
| for i in range(0, len(hexstream), 2): |
| if 0 == (i % hex_digits_per_line): |
| hexstring += "\n" |
| hexstring += '0x' + hexstream[i:i+2] + ", " |
| |
| hexstring += '};\n' |
| return [hexstring] |
| |
| |
| def main(args): |
| if not os.path.isfile(args.tflite_path): |
| raise Exception(f"{args.tflite_path} not found") |
| |
| # Cpp filename: |
| cpp_filename = Path(os.path.join(args.output_dir, os.path.basename(args.tflite_path) + ".cc")).absolute() |
| print(f"++ Converting {os.path.basename(args.tflite_path)} to\ |
| {os.path.basename(cpp_filename)}") |
| |
| os.makedirs(cpp_filename.parent, exist_ok=True) |
| |
| header_template = env.get_template(args.license_template) |
| |
| hdr = header_template.render(script_name=os.path.basename(__file__), |
| file_name=os.path.basename(args.tflite_path), |
| gen_time=datetime.datetime.now(), |
| year=datetime.datetime.now().year) |
| |
| env.get_template('tflite.cc.template').stream(common_template_header=hdr, |
| model_data=get_tflite_data(args.tflite_path), |
| expressions=args.expr, |
| additional_headers=args.headers, |
| namespaces=args.namespaces).dump(str(cpp_filename)) |
| |
| |
| if __name__ == '__main__': |
| main(args) |