Support PT2E save and load (#1918)

Signed-off-by: Kaihui-intel <kaihui.tang@intel.com>

Author: Kaihui-intel

neural_compressor/torch/algorithms/pt2e_quant/__init__.py

@@ -14,3 +14,4 @@
 
 
 from neural_compressor.torch.algorithms.pt2e_quant.core import W8A8PT2EQuantizer
+from .save_load import save, load

neural_compressor/torch/algorithms/pt2e_quant/save_load.py

@@ -0,0 +1,42 @@
+# Copyright (c) 2024 Intel Corporation
+#
+# 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.
+
+import json
+import os
+
+import torch
+
+from neural_compressor.common.utils import load_config_mapping, save_config_mapping
+from neural_compressor.torch.utils import QCONFIG_NAME, WEIGHT_NAME, logger
+
+
+def save(model, example_inputs, output_dir="./saved_results"):
+    os.makedirs(output_dir, exist_ok=True)
+    qmodel_file_path = os.path.join(os.path.abspath(os.path.expanduser(output_dir)), WEIGHT_NAME)
+    qconfig_file_path = os.path.join(os.path.abspath(os.path.expanduser(output_dir)), QCONFIG_NAME)
+    quantized_ep = torch.export.export(model, example_inputs)
+    torch.export.save(quantized_ep, qmodel_file_path)
+    for key, op_config in model.qconfig.items():
+        model.qconfig[key] = op_config.to_dict()
+    with open(qconfig_file_path, "w") as f:
+        json.dump(model.qconfig, f, indent=4)
+
+    logger.info("Save quantized model to {}.".format(qmodel_file_path))
+    logger.info("Save configuration of quantized model to {}.".format(qconfig_file_path))
+
+
+def load(output_dir="./saved_results"):
+    qmodel_file_path = os.path.join(os.path.abspath(os.path.expanduser(output_dir)), WEIGHT_NAME)
+    loaded_quantized_ep = torch.export.load(qmodel_file_path)
+    return loaded_quantized_ep.module()

neural_compressor/torch/quantization/algorithm_entry.py

@@ -210,6 +210,7 @@ def static_quant_entry(
 def pt2e_dynamic_quant_entry(model: torch.nn.Module, configs_mapping, mode: Mode, *args, **kwargs) -> torch.nn.Module:
     logger.info("Quantize model with the PT2E static quant algorithm.")
     from neural_compressor.torch.algorithms.pt2e_quant.core import W8A8PT2EQuantizer
+    from neural_compressor.torch.algorithms.pt2e_quant.save_load import save
 
     run_fn = kwargs.get("run_fn", None)
     example_inputs = kwargs.get("example_inputs", None)
@@ -221,6 +222,8 @@ def pt2e_dynamic_quant_entry(model: torch.nn.Module, configs_mapping, mode: Mode
             model = w8a8_quantizer.execute(
                 model, mode=mode, run_fn=run_fn, example_inputs=example_inputs, inplace=inplace
             )
+            model.qconfig = configs_mapping
+            model.save = MethodType(save, model)
             return model
 
 
@@ -230,6 +233,7 @@ def pt2e_dynamic_quant_entry(model: torch.nn.Module, configs_mapping, mode: Mode
 def pt2e_static_quant_entry(model: torch.nn.Module, configs_mapping, mode: Mode, *args, **kwargs) -> torch.nn.Module:
     logger.info("Quantize model with the PT2E static quant algorithm.")
     from neural_compressor.torch.algorithms.pt2e_quant.core import W8A8PT2EQuantizer
+    from neural_compressor.torch.algorithms.pt2e_quant.save_load import save
 
     run_fn = kwargs.get("run_fn", None)
     example_inputs = kwargs.get("example_inputs", None)
@@ -240,6 +244,8 @@ def pt2e_static_quant_entry(model: torch.nn.Module, configs_mapping, mode: Mode,
             model = w8a8_quantizer.execute(
                 model, mode=mode, run_fn=run_fn, example_inputs=example_inputs, inplace=inplace
             )
+            model.qconfig = configs_mapping
+            model.save = MethodType(save, model)
             return model
 
 

neural_compressor/torch/quantization/load_entry.py

@@ -85,6 +85,10 @@ def load(model_name_or_path, original_model=None, format="default", device="cpu"
             from neural_compressor.torch.algorithms import static_quant
 
             return static_quant.load(model_name_or_path)
+        elif "static_quant" in per_op_qconfig.keys() or "pt2e_dynamic_quant" in per_op_qconfig.keys():  # PT2E
+            from neural_compressor.torch.algorithms import pt2e_quant
+
+            return pt2e_quant.load(model_name_or_path)
         else:
             config_mapping = load_config_mapping(qconfig_file_path, ConfigRegistry.get_all_configs()["torch"])
             # select load function
@@ -102,6 +106,7 @@ def load(model_name_or_path, original_model=None, format="default", device="cpu"
                 from neural_compressor.torch.algorithms import habana_fp8
 
                 return habana_fp8.load(model_name_or_path, original_model)
+
     elif format == LoadFormat.HUGGINGFACE.value:
         # now only support load huggingface WOQ causal language model
         from neural_compressor.torch.algorithms import weight_only

test/3x/torch/quantization/test_pt2e_quant.py

@@ -1,6 +1,4 @@
-import os
-import unittest
-from unittest.mock import patch
+import shutil
 
 import pytest
 import torch
@@ -33,6 +31,8 @@ def _is_ipex_imported():
 
 
 class TestPT2EQuantization:
+    def teardown_class(self):
+        shutil.rmtree("saved_results", ignore_errors=True)
 
     @staticmethod
     def get_toy_model():
@@ -114,6 +114,18 @@ def calib_fn(model):
         config.freezing = True
         q_model_out = q_model(*example_inputs)
         assert torch.allclose(float_model_output, q_model_out, atol=1e-2), "Quantization failed!"
+
+        # test save and load
+        q_model.save(
+            example_inputs=example_inputs,
+            output_dir="./saved_results",
+        )
+        from neural_compressor.torch.quantization import load
+
+        loaded_quantized_model = load("./saved_results")
+        loaded_q_model_out = loaded_quantized_model(*example_inputs)
+        assert torch.equal(loaded_q_model_out, q_model_out)
+
         opt_model = torch.compile(q_model)
         out = opt_model(*example_inputs)
         logger.warning("out shape is %s", out.shape)