Adapt rewrite module to MLIA coding standards

- Fix imports
- Update variable names
- Refactor helper functions
- Add licence headers
- Add docstrings
- Use f-strings rather than % notation
- Create type annotations in rewrite module
- Migrate from tqdm to rich progress bar
- Use logging module in rewrite module: All print statements are
  replaced with logging module

Resolves: MLIA-831, MLIA-842, MLIA-844, MLIA-846
Signed-off-by: Benjamin Klimczak <benjamin.klimczak@arm.com>
Change-Id: Idee37538d72b9f01128a894281a8d10155f7c17c

1 files changed, 14 insertions, 8 deletions

diff --git a/src/mlia/nn/rewrite/core/utils/utils.py b/src/mlia/nn/rewrite/core/utils/utils.py
index d1ed322..ddf0cc2 100644
--- a/src/mlia/nn/rewrite/core/utils/utils.py
+++ b/src/mlia/nn/rewrite/core/utils/utils.py
@@ -1,22 +1,28 @@
 # SPDX-FileCopyrightText: Copyright 2023, Arm Limited and/or its affiliates.
 # SPDX-License-Identifier: Apache-2.0
-import os
+"""Model and file system utilites."""
+from __future__ import annotations
+
+from pathlib import Path
 
 import flatbuffers
-from tensorflow.lite.python import schema_py_generated as schema_fb
+from tensorflow.lite.python.schema_py_generated import Model
+from tensorflow.lite.python.schema_py_generated import ModelT
 
 
-def load(input_tflite_file):
-    if not os.path.exists(input_tflite_file):
-        raise FileNotFoundError("TFLite file not found at %r\n" % input_tflite_file)
+def load(input_tflite_file: str | Path) -> ModelT:
+    """Load a flatbuffer model from file."""
+    if not Path(input_tflite_file).exists():
+        raise FileNotFoundError(f"TFLite file not found at {input_tflite_file}\n")
     with open(input_tflite_file, "rb") as file_handle:
         file_data = bytearray(file_handle.read())
-    model_obj = schema_fb.Model.GetRootAsModel(file_data, 0)
-    model = schema_fb.ModelT.InitFromObj(model_obj)
+    model_obj = Model.GetRootAsModel(file_data, 0)
+    model = ModelT.InitFromObj(model_obj)
     return model
 
 
-def save(model, output_tflite_file):
+def save(model: ModelT, output_tflite_file: str | Path) -> None:
+    """Save a flatbuffer model to a given file."""
     builder = flatbuffers.Builder(1024)  # Initial size of the buffer, which
     # will grow automatically if needed
     model_offset = model.Pack(builder)