fix bf16 symbolic_trace bug (#1892)

Description: fix bf16 symbolic_trace bug,

- cause abnormal recursive calling.
- missing necessary attributes
- By moving BF16 fallback ahead of quantization and removing bf16_symbolic_trace, we fix it.

---------

Signed-off-by: xin3he <xin3.he@intel.com>
Co-authored-by: Sun, Xuehao <xuehao.sun@intel.com>

Author: xin3he

neural_compressor/adaptor/pytorch.py

@@ -1242,6 +1242,8 @@ def _combine_capability(self, bf16_ops, q_capability):
                 q_capability["opwise"][bf16_op] = [bf16_config, fp32_config]
                 if bf16_op[1] not in q_capability["optypewise"]:
                     q_capability["optypewise"][bf16_op[1]] = [bf16_config, fp32_config]
+            if bf16_op[1] in q_capability["optypewise"] and bf16_config not in q_capability["optypewise"][bf16_op[1]]:
+                q_capability["optypewise"][bf16_op[1]].append(bf16_config)
         return q_capability
 
     def get_fused_list(self, model):
@@ -3579,6 +3581,16 @@ def quantize(self, tune_cfg, model, dataloader, q_func=None):
             return q_model
 
         self.tune_cfg["fx_sub_module_list"] = self.sub_module_list
+
+        # BF16 fallback
+        if (
+            len(self.tune_cfg["bf16_ops_list"]) > 0
+            and self.version.release >= Version("1.11.0").release
+            and self.use_bf16
+            and (CpuInfo().bf16 or os.getenv("FORCE_BF16") == "1")
+        ):  # pragma: no cover
+            q_model._model = torch_utils.bf16_convert.Convert(q_model._model, self.tune_cfg)
+
         if self.approach == "quant_aware_training":
             q_model._model.train()
             if self.sub_module_list is None:
@@ -3665,14 +3677,6 @@ def quantize(self, tune_cfg, model, dataloader, q_func=None):
                 self.sub_module_list, q_model._model, prefix="", custom_config=self.prepare_custom_config_dict
             )
 
-        if (
-            len(self.tune_cfg["bf16_ops_list"]) > 0
-            and self.version.release >= Version("1.11.0").release
-            and self.use_bf16
-            and (CpuInfo().bf16 or os.getenv("FORCE_BF16") == "1")
-        ):  # pragma: no cover
-            q_model._model = torch_utils.bf16_convert.Convert(q_model._model, self.tune_cfg)
-
         self.fused_dict = self.get_fused_list(q_model.model)
         q_model.is_quantized = True
         q_model.q_config = copy.deepcopy(self.tune_cfg)

neural_compressor/adaptor/pytorch_cpu.yaml

@@ -19,7 +19,7 @@
     name: '1.11'
 
   bf16: ['Linear', 'bmm', 'mm', 'baddbmm', 'addmm', 'addbmm',
-          '_convolution', 'LSTM', 'LSTMCell', 'GRU', 'GRUCell']
+          'Conv1d', 'Conv2d', 'Conv3d', 'LSTM', 'LSTMCell', 'GRU', 'GRUCell']
   fp32: ['*'] # `*` means all op types.
   int8: &1_11_capabilities {
     'static': &cap_s8_1_11 {

neural_compressor/adaptor/torch_utils/bf16_convert.py

@@ -17,7 +17,6 @@
 """Bf16 Convert for Torch Utils."""
 import torch
 import torch.nn as nn
-from torch.fx import symbolic_trace
 
 from ...utils import logger
 
@@ -28,6 +27,7 @@ class BF16ModuleWrapper(nn.Module):
     def __init__(self, module):
         """Init a BF16ModuleWrapper object."""
         super(BF16ModuleWrapper, self).__init__()
+        module = module.bfloat16()
         self.add_module("module", module)
         self.train(module.training)
         # WA for TransformerEncoder to access its Linear's weights and bias
@@ -38,7 +38,6 @@ def __init__(self, module):
     def forward(self, X):
         """Convert dtype."""
         X = X.to(torch.bfloat16)
-        self.module.bfloat16()
         X = self.module(X)
         return X.float()
 
@@ -54,44 +53,18 @@ def Convert(model, tune_cfg):
         mixed_precision_model (object): model with mixed precision.
     """
     bf16_ops_list = tune_cfg["bf16_ops_list"]
-    fx_sub_module_list = tune_cfg["fx_sub_module_list"] if "fx_sub_module_list" in tune_cfg.keys() else []
     if len(bf16_ops_list) > 0:
         logger.info("Convert operators to bfloat16")
     mixed_precision_model = _bf16_wrapper_model(model, bf16_ops_list)
-    if fx_sub_module_list is not None and len(fx_sub_module_list) > 0:
-        mixed_precision_model = bf16_symbolic_trace(mixed_precision_model, fx_sub_module_list)
     return mixed_precision_model
 
 
 def _bf16_wrapper_model(model, bf16_ops_list, prefix=""):
     for name, child in model.named_children():
         op_name = prefix + "." + name if prefix != "" else name
         for bf16_op_name in bf16_ops_list:
-            if op_name == bf16_op_name[0]:
+            if op_name == bf16_op_name[0] or op_name == bf16_op_name[0].split(".module")[0]:
                 child = BF16ModuleWrapper(child)
-        else:
-            _bf16_wrapper_model(child, bf16_ops_list, op_name)
-            setattr(model, name, child)
-    return model
-
-
-def bf16_symbolic_trace(model, fx_sub_module_list, prefix=""):
-    """Symbolic trace for bf16 models.
-
-    Args:
-        model (object): the input model.
-        fx_sub_module_list (list): _description_
-        prefix (str): prefix of op name.
-
-    Returns:
-        model (object)
-    """
-    for name, child in model.named_children():
-        op_name = prefix + "." + name if prefix != "" else name
-        for fx_sub_module_name in fx_sub_module_list:
-            if op_name == fx_sub_module_name:
-                child = symbolic_trace(child)
-        else:
-            bf16_symbolic_trace(child, fx_sub_module_list, op_name)
-            setattr(model, name, child)
+                setattr(model, name, child)
+        _bf16_wrapper_model(child, bf16_ops_list, op_name)
     return model

test/adaptor/pytorch_adaptor/test_adaptor_pytorch_2x.py

@@ -392,21 +392,15 @@ def test_fx_sub_module_quant(self):
         "Please use PyTroch 1.11 or higher version for mixed precision with pytorch_fx or pytorch backend",
     )
     def test_mix_precision(self):
+        os.environ["FORCE_BF16"] = "1"
         model_origin = DynamicControlModel()
-        # run fx_quant in neural_compressor and save the quantized GraphModule
         dataset = Datasets("pytorch")["dummy"]((100, 3, 224, 224))
         dataloader = DataLoader("pytorch", dataset)
         set_workspace("./saved")
+        # fx mode usually has .module suffix due to tracing of the entire model fails, so use conv.* to leverage re.match
+        ptq_fx_op_name_list["conv.*"] = {"weight": {"dtype": "bf16"}, "activation": {"dtype": "bf16"}}
         conf = PostTrainingQuantConfig(op_name_dict=ptq_fx_op_name_list)
         q_model = quantization.fit(model_origin, conf, calib_dataloader=dataloader, calib_func=eval_func)
-        tune_cfg = q_model.q_config
-        tune_cfg["op"][("conv.module", "Conv2d")].clear()
-        tune_cfg["op"][("conv.module", "Conv2d")] = {"weight": {"dtype": "bf16"}, "activation": {"dtype": "bf16"}}
-        tune_cfg["bf16_ops_list"].append(("conv.module", "Conv2d"))
-        from neural_compressor.adaptor.torch_utils.bf16_convert import Convert
-
-        q_model._model = Convert(q_model._model, tune_cfg)
-
         self.assertEqual(q_model._model.conv.module.module.weight.dtype, torch.bfloat16)
         self.assertEqual(q_model._model.conv.module.module.bias.dtype, torch.bfloat16)