fix bug in TorchSmoothQuant (#1149)

* [bug fix] when folding=False and QKV is not fully converted to SQLinear.

Signed-off-by: Xin He <[email protected]>

---------

Signed-off-by: Xin He <[email protected]>

Author: xin3he

neural_compressor/adaptor/pytorch.py

@@ -2605,7 +2605,8 @@ def quantize(self, tune_cfg, model, dataloader, q_func=None):
         if self.version.release >= Version("1.12.0").release:
             # Check save_qconf_summary part is a workaroud for IPEX bug.
             # Sometimes the prepared model from get_op_capablitiy loss this attribute
-            if not hasattr(model._model, "save_qconf_summary"):
+            if not hasattr(model._model, "save_qconf_summary") or \
+              not hasattr(model._model, "load_qconf_summary"):
                 from torch.ao.quantization import MinMaxObserver, PerChannelMinMaxObserver, QConfig
                 if self.version.release >= Version("2.1").release:
                     static_qconfig = ipex.quantization.default_static_qconfig_mapping
@@ -2950,7 +2951,7 @@ def _get_quantizable_ops_recursively(self, model, prefix, quantizable_ops):
                 ipex_conf.save(self.ipex_config_path)
             else:
                 if self.approach in ['post_training_static_quant', 'post_training_auto_quant']:
-                    assert self.q_dataloader or self.example_inputs, \
+                    assert self.q_dataloader is not None or self.example_inputs is not None, \
                             "IPEX need q_dataloader or example_inputs to prepare the model"
                     from torch.ao.quantization import MinMaxObserver, PerChannelMinMaxObserver, QConfig
                     if self.version.release >= Version("2.1").release:
@@ -2983,7 +2984,7 @@ def _get_quantizable_ops_recursively(self, model, prefix, quantizable_ops):
                         model = ipex.quantization.prepare(model, static_qconfig,
                                                               example_inputs=self.example_inputs, inplace=True)
 
-                if self.q_dataloader or self.example_inputs:
+                if self.q_dataloader is not None or self.example_inputs is not None:
                     self._simple_inference(model, self.q_dataloader, iterations=1)
                 else:
                     try:
@@ -3141,7 +3142,8 @@ def qdq_quantize(self, model, q_model, tune_cfg, dataloader, q_func):
 
         # Check save_qconf_summary part is a workaroud for IPEX bug.
         # Sometimes the prepared model from get_op_capablitiy loss this attribute
-        if not hasattr(model._model, "save_qconf_summary"):
+        if not hasattr(model._model, "save_qconf_summary") or \
+          not hasattr(model._model, "load_qconf_summary"):
             static_qconfig = ipex.quantization.get_smooth_quant_qconfig_mapping(alpha=0.5)
             if isinstance(self.example_inputs, dict):
                 model._model = ipex.quantization.prepare(model._model, static_qconfig,

neural_compressor/adaptor/torch_utils/smooth_quant.py

@@ -501,44 +501,43 @@ def _reshape_scale_for_input(self, layer, scale):
 
         return scale
 
-    def _scale_layer_weight(self, layer_name, scale):  ##input channel
+    def _scale_layer_weight(self, layer_name, scale, alpha=0.5, input_minmax=None):  ##input channel
         """
         Scale the layer weights at input channel, depthwise conv output channel
         :param layer_name: The layer name
         :param scale: The scale to be multiplied
+        :param alpha: alpha for SQLinearWrapper
+        :param input_minmax: input_minmax for SQLinearWrapper
         :return:
         """
         layer = get_module(self.model, layer_name)
-        if layer.__class__.__name__ == "SQLinearWrapper":
-            return scale # weigth update is done in SQLinearWrapper initialization
-        scale = self._reshape_scale_for_weight(layer, scale)
-        layer.weight = torch.nn.Parameter(layer.weight * scale)
+        if self.insert_mul:
+            from .model_wrapper import SQLinearWrapper
+            layer = get_module(self.model, layer_name)
+            if isinstance(layer, SQLinearWrapper):
+                layer._recover_sq_linear()
+                set_module(self.model, layer_name, layer.sq_linear)  ##recover
+            else:
+                new_module = SQLinearWrapper(layer, 1.0 / scale, input_minmax, alpha)
+                set_module(self.model, layer_name, new_module)
+        elif self.allow_absorb:
+            scale = self._reshape_scale_for_weight(layer, scale)
+            layer.weight = torch.nn.Parameter(layer.weight * scale)
         return scale
 
-    def _absorb_scales(self, layer_name, scale, alpha=0.5):  ##output channel
+    def _absorb_scales(self, layer_name, scale):  ##output channel
         """
         Absorb the scale to the layer at output channel
         :param layer_name: The module name
         :param scale: The scale to be absorbed
         :param alpha_key: The alpha passed to SQLinearWrapper
         :return:
         """
-        layer = get_module(self.model, layer_name)
-        if self.insert_mul:
-            if layer.__class__.__name__ == "SQLinearWrapper":
-                layer._recover_sq_linear()
-                set_module(self.model, layer_name, layer.sq_linear)  ##recover
-            else:
-                from .model_wrapper import SQLinearWrapper
-                input_minmax = [self.input_mins[layer_name], self.input_maxes[layer_name]]
-                new_module = SQLinearWrapper(layer, scale, input_minmax, alpha)
-                set_module(self.model, layer_name, new_module)
-            return
-
-        if not self.allow_absorb:
-            return  ## change the code style due to too many if/else statements in the following
+        if self.insert_mul or not self.allow_absorb:
+            return  # absorb is updated in SQLinearWrapper in def _scale_layer_weight
 
         ##if self.allow absorb
+        layer = get_module(self.model, layer_name)
         if layer.__class__.__name__ == 'WrapperLayer':
             layer = layer.orig_layer
         if isinstance(layer, torch.nn.BatchNorm2d) or isinstance(layer, torch.nn.GroupNorm) or \
@@ -650,7 +649,9 @@ def _adjust_parameters(self, absorb_to_layer, input_maxes, alpha=0.5, tuning=Fal
         :param alpha: Alpha value to balance the quantization difficulty of activation and weight, a float of a dict
         :return:
         """
-        absorb_scales_info, weight_scales_info = self._cal_scales(absorb_to_layer, input_maxes, alpha, tuning)
+        absorb_scales_info, weight_scales_info = self._cal_scales(
+            absorb_to_layer, input_maxes, alpha, tuning
+        )
         if not absorb_scales_info or not weight_scales_info:
             return weight_scales_info, absorb_scales_info 
         for index, key in enumerate(absorb_to_layer.keys()):
@@ -659,10 +660,13 @@ def _adjust_parameters(self, absorb_to_layer, input_maxes, alpha=0.5, tuning=Fal
             elif isinstance(alpha, dict):
                 alpha_tmp = alpha[key]
             absorb_scale = absorb_scales_info[key]
-            self._absorb_scales(key, absorb_scale, alpha_tmp)
+            self._absorb_scales(key, absorb_scale)
             layer_names = absorb_to_layer[key]
             for layer_name in layer_names:
-                self._scale_layer_weight(layer_name, weight_scales_info[layer_name])
+                input_minmax = [self.input_mins[layer_names[0]], self.input_maxes[layer_names[0]]]
+                self._scale_layer_weight(
+                    layer_name, weight_scales_info[layer_name], alpha_tmp, input_minmax
+                )
         return weight_scales_info, absorb_scales_info
 
     def _check_need_calibration(self, alpha, percentile, op_types,
@@ -1110,10 +1114,14 @@ def _get_example_input(self):
         if self.dataloader == None and self.example_inputs == None:
             return None
         if self.example_inputs is None:
-            ##assert self.dataloader, "Please provide dataloader or example_inputs"
-            for idx, input in enumerate(self.dataloader):
-                self.example_inputs = input
-                break
+            try:
+                for idx, (input, label) in enumerate(self.dataloader):
+                    self.example_inputs = input
+                    break
+            except:
+                for idx, input in enumerate(self.dataloader):
+                    self.example_inputs = input
+                    break
 
         return self.example_inputs
 

test/algorithm/test_smooth_quant.py

@@ -273,19 +273,22 @@ def __init__(self):
                 self.norm = torch.nn.GroupNorm(num_channels=4, num_groups=2)
                 self.act = torch.nn.ReLU()
                 self.conv2 = torch.nn.Conv2d(4, 3, 1, 1)
+                self.conv3 = torch.nn.Conv2d(4, 3, 1, 1)
 
             def forward(self, x):
                 out = self.conv1(x)
                 out = self.norm(out)
                 out = self.act(out)
-                out = self.conv2(out)
+                tmp1 = self.conv2(out)
+                tmp2 = self.conv3(out)
+                out = tmp1 + tmp2
                 return out
 
         model = Model()
 
         sq = TorchSmoothQuant(model, self.conv_dl)
         sq.transform(alpha=0.6, calib_iter=2, folding=True)
-        assert len(sq.absorb_to_layer) == 1
+        assert len(sq.absorb_to_layer['norm']) == 2
 
     def test_sq_add(self):
         class Model(torch.nn.Module):
@@ -626,6 +629,15 @@ def forward(self, x):
         sq.transform(alpha=0.5, calib_iter=1) # By default, folding=False
         assert isinstance(sq.model.fc1, SQLinearWrapper)
 
+    def test_sq_qkv(self):
+        model = transformers.AutoModelForCausalLM.from_pretrained(
+                        'facebook/opt-125m', torchscript=True,)
+        sq = TorchSmoothQuant(model, LLMCalibDataloader())
+        sq.transform(alpha=0.5, calib_iter=-1, folding=False)
+        assert isinstance(
+            sq.model.model.decoder.layers[0].self_attn.k_proj, SQLinearWrapper
+        )
+
     def test_sq_quant(self):
         from neural_compressor import PostTrainingQuantConfig, quantization
         class Model(torch.nn.Module):
@@ -734,6 +746,7 @@ def calib_func(model):
             calib_func=calib_func,
         )
 
+        fp32_model = Model()
         conf = PostTrainingQuantConfig(
             backend="ipex",
             calibration_sampling_size=8,