1 files changed, 97 insertions, 0 deletions
diff --git a/scripts/py/gen_model_cpp.py b/scripts/py/gen_model_cpp.py
new file mode 100644
index 0000000..4843668
--- /dev/null
+++ b/scripts/py/gen_model_cpp.py
@@ -0,0 +1,97 @@
+#  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
+
+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 write_tflite_data(tflite_path):
+    # Extract array elements
+
+    bytes = model_hex_bytes(tflite_path)
+    line = '{\n'
+    i = 1
+    while True:
+        try:
+            el = next(bytes)
+            line = line + el + ', '
+            if i % 20 == 0:
+                yield line
+                line = ''
+            i += 1
+        except StopIteration:
+            line = line[:-2] + '};\n'
+            yield line
+            break
+
+
+def model_hex_bytes(tflite_path):
+    with open(tflite_path, 'rb') as tflite_model:
+        byte = tflite_model.read(1)
+        while byte != b"":
+            yield f'0x{byte.hex()}'
+            byte = tflite_model.read(1)
+
+
+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=write_tflite_data(args.tflite_path),
+                                                  expressions=args.expr,
+                                                  additional_headers=args.headers,
+                                                  namespaces=args.namespaces).dump(str(cpp_filename))
+
+
+if __name__ == '__main__':
+    main(args)