[SW-219274] - Changing the quant method name in lm-head (#150) (#2132)

* [SW-219274] - Changing the quant method name in lm-head (#150)

* Update helper_modules.py

---------

Co-authored-by: Nir David <[email protected]>

Author: changwangss

neural_compressor/torch/algorithms/fp8_quant/_quant_common/helper_modules.py

@@ -233,21 +233,21 @@ class PatchedParallelLMHead(PatchedModuleBase):
     def __init__(self, mod, parent, mod_extra_config, *args, **kwargs):
         super().__init__(mod, parent, mod_extra_config, *args, **kwargs)
         # ParallelLMHead inherits from VocabParallelEmbedding (nn.module) which has a member called
-        # "linear_method" of type UnquantizedEmbeddingMethod that inherits from QuantizeMethodBase
+        # "quant_method" of type UnquantizedEmbeddingMethod that inherits from QuantizeMethodBase
         # (both are not nn.module) and implement an "apply" method by using torch.nn.functional.linear
         # (Apply the weights in layer to the input tensor.)
         # ParallelLMHead's forward method should not be called because LMHead's weights should be used
         # in the sampler. (The forward itself throws RuntimeError exception)
-        # So in order to quantize that linear_method we patch only the "apply" method.
+        # So in order to quantize that quant_method we patch only the "apply" method.
         init_linear(self, mod_extra_config)
-        self.orig_linear_apply = types.MethodType(mod.linear_method.apply.__func__, self)
+        self.orig_linear_quant_apply = self.orig_mod.quant_method.apply
         if self.quantization_mode in [QuantMode.QUANTIZE, QuantMode.LOAD]:
             if self.use_qdq or self.fake_quant:
-                self.linear_method.apply = self.apply_qdq
+                self.quant_method.apply = self.apply_qdq
             else:
-                self.linear_method.apply = self.apply_quant
+                self.quant_method.apply = self.apply_quant
         elif (self.quantization_mode == QuantMode.MEASURE) or (self.quantization_mode == QuantMode.SHAPE):
-            self.linear_method.apply = self.apply_measure
+            self.quant_method.apply = self.apply_measure
 
     def apply_quant(self, layer, x, bias):
         qinput = self.quant_input(x)
@@ -273,7 +273,7 @@ def apply_qdq(self, layer, x, bias):
 
     def apply_measure(self, layer, x, bias):
         measure_input((x,), observer=self._mod_extra_config.inputs)
-        output = self.orig_linear_apply(layer, x, bias)
+        output = self.orig_linear_quant_apply(layer, x, bias)
         measure_output((output,), self._mod_extra_config.outputs)
         return output