MLIA-845 Migrate rewrite code

- Add required files for rewriting of TensorFlow Lite graphs
- Adapt rewrite dependency paths and project name
- Add license headers

Change-Id: I19c5f63215fe2af2fa7d7d44af08144c6c5f911c
Signed-off-by: Benjamin Klimczak <benjamin.klimczak@arm.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/src/mlia/nn/rewrite/core/extract.py b/src/mlia/nn/rewrite/core/extract.py
new file mode 100644
index 0000000..5fcd348
--- /dev/null
+++ b/src/mlia/nn/rewrite/core/extract.py
@@ -0,0 +1,87 @@
+# SPDX-FileCopyrightText: Copyright 2023, Arm Limited and/or its affiliates.
+# SPDX-License-Identifier: Apache-2.0
+import os
+
+os.environ["TF_CPP_MIN_LOG_LEVEL"] = "3"
+import tensorflow as tf
+
+tf.compat.v1.logging.set_verbosity(tf.compat.v1.logging.ERROR)
+
+from mlia.nn.rewrite.core.graph_edit.cut import cut_model
+from mlia.nn.rewrite.core.graph_edit.record import record_model
+
+
+def extract(
+    output_path,
+    model_file,
+    input_data,
+    input_names,
+    output_names,
+    subgraph=0,
+    skip_outputs=False,
+    show_progress=False,
+    num_procs=1,
+    num_threads=0,
+):
+    try:
+        os.mkdir(output_path)
+    except FileExistsError:
+        pass
+
+    start_file = os.path.join(output_path, "start.tflite")
+    cut_model(
+        model_file,
+        input_names=None,
+        output_names=input_names,
+        subgraph_index=subgraph,
+        output_file=start_file,
+    )
+
+    input_tfrec = os.path.join(output_path, "input.tfrec")
+    record_model(
+        input_data,
+        start_file,
+        input_tfrec,
+        show_progress=show_progress,
+        num_procs=num_procs,
+        num_threads=num_threads,
+    )
+
+    replace_file = os.path.join(output_path, "replace.tflite")
+    cut_model(
+        model_file,
+        input_names=input_names,
+        output_names=output_names,
+        subgraph_index=subgraph,
+        output_file=replace_file,
+    )
+
+    end_file = os.path.join(output_path, "end.tflite")
+    cut_model(
+        model_file,
+        input_names=output_names,
+        output_names=None,
+        subgraph_index=subgraph,
+        output_file=end_file,
+    )
+
+    if not skip_outputs:
+        output_tfrec = os.path.join(output_path, "output.tfrec")
+        record_model(
+            input_tfrec,
+            replace_file,
+            output_tfrec,
+            show_progress=show_progress,
+            num_procs=num_procs,
+            num_threads=num_threads,
+        )
+
+        end_tfrec = os.path.join(output_path, "end.tfrec")
+        record_model(
+            output_tfrec,
+            end_file,
+            end_tfrec,
+            show_progress=show_progress,
+            num_procs=num_procs,
+            num_threads=num_threads,
+        )