fix SQ auto bug (#1294)

Signed-off-by: wenhuach21 <wenhua.cheng@intel.com>
(cherry picked from commit 1730de0)

Author: wenhuach21

neural_compressor/adaptor/torch_utils/smooth_quant.py

@@ -794,20 +794,20 @@ def dict_to_list(dic):
                 raise NotImplementedError
         return best_alpha
 
-    def _auto_tune_alpha_new(
+    def _auto_tune_alpha(
         self, input_maxes, calib_sample_num=32, alpha_min=0.3, alpha_max=0.7, alpha_step=0.05, shared_criterion="min"
     ):
         """Perform alpha-tuning to obtain layer-wise optimal alpha values and adjust parameters accordingly.
 
         This function takes quantization of the former layers into consideration when qdq one layer
         Also, it reduces the memory usage at the cost of increasingtuning time
-        TODO may have compatibility issue when setting folding=True
-        :param input_maxes:
-        :param calib_sample_num:
-        :param alpha_min:
-        :param alpha_max:
-        :param alpha_step:
-        :param shared_criterion:
+        TODO may have compatibility issue when setting folding=True, check whether having issues when bs!=1
+        :param input_maxes: calibration data, input max
+        :param calib_sample_num: sample count used to auto tuning alpha
+        :param alpha_min: the min value of alpha
+        :param alpha_max: the max value of alpha
+        :param alpha_step:  the alpha step in search space
+        :param shared_criterion: the criterion to choose alpha when multiple layers must share one same alpha
         :return:
         """
         logger.info("start sq auto tuning")
@@ -830,13 +830,16 @@ def _auto_tune_alpha_new(
             self.absorb_to_layer, input_maxes, default_alpha, tuning=True
         )
         self._update_scales_for_auto(absorb_input_scales, weight_scales)
-        cnt = 0
+        total_cnt = 0
+        tmp_cnt = 0
         alpha_update_iter = 0
         # multiply_factor is used to combine samples to calib_sample_num // 4 before summarizing the best alpha
-        multiply_factor = calib_sample_num // 4 if calib_sample_num >= 4 else calib_sample_num
+        tune_cnt = 4
+        multiply_factor = calib_sample_num // tune_cnt if calib_sample_num >= tune_cnt else calib_sample_num
 
         best_alphas = default_alpha
         if not self.dataloader:
+            logger.info(f"Auto-tuning failed due to no dataloader, using {best_alphas} instead.")
             self._qdq_model_unwrapper_for_auto()
             return best_alphas
         try:
@@ -857,18 +860,19 @@ def _auto_tune_alpha_new(
                         cur_loss = loss_alphas[key]
                         for alpha_key in cur_loss.keys():
                             cur_loss[alpha_key] += loss_tmp[key][alpha_key]
-                cnt += self.dataloader.batch_size
-                if cnt // multiply_factor >= 1:
+                total_cnt += self.dataloader.batch_size
+                tmp_cnt += self.dataloader.batch_size
+                if tmp_cnt // multiply_factor >= 1:
                     alpha_update_iter += 1
-                    cnt = 0
+                    tmp_cnt = 0
                     best_alphas = self._get_best_alpha(self.absorb_to_layer, loss_alphas, shared_criterion)
                     for key in best_alphas.keys():
                         logger.info(f"Auto alpha update iter: {alpha_update_iter}, {key}: {best_alphas[key]}")
                     absorb_input_scales, weight_scales = self._cal_scales(
                         self.absorb_to_layer, input_maxes, best_alphas, tuning=True
                     )
                     self._update_scales_for_auto(absorb_input_scales, weight_scales)
-                if cnt >= calib_sample_num:
+                if total_cnt >= calib_sample_num:
                     break
         except:
             for input in self.dataloader:
@@ -888,10 +892,11 @@ def _auto_tune_alpha_new(
                         cur_loss = loss_alphas[key]
                         for alpha_key in cur_loss.keys():
                             cur_loss[alpha_key] += loss_tmp[key][alpha_key]
-                cnt += self.dataloader.batch_size
-                if cnt // multiply_factor >= 1:
+                total_cnt += self.dataloader.batch_size
+                tmp_cnt += self.dataloader.batch_size
+                if tmp_cnt // multiply_factor >= 1:
                     alpha_update_iter += 1
-                    cnt = 0
+                    tmp_cnt = 0
 
                     best_alphas = self._get_best_alpha(self.absorb_to_layer, loss_alphas, shared_criterion)
                     for key in best_alphas.keys():
@@ -900,7 +905,7 @@ def _auto_tune_alpha_new(
                         self.absorb_to_layer, input_maxes, best_alphas, tuning=True
                     )
                     self._update_scales_for_auto(absorb_input_scales, weight_scales)
-                if cnt >= calib_sample_num:
+                if total_cnt >= calib_sample_num:
                     break
 
         best_alphas = self._get_best_alpha(self.absorb_to_layer, loss_alphas, shared_criterion)
@@ -934,7 +939,6 @@ def transform(
             logger.warning("smooth quant is ignored since the model is not a torch module")
             return self.model
 
-        logger.info("call new sq")  ##TODO need to remove later
         if folding:
             self.insert_mul, self.allow_absorb = False, True
         else:
@@ -994,7 +998,7 @@ def transform(
                         del self.absorb_to_layer[d]
 
                 if alpha == "auto":
-                    self.alpha_per_layer = self._auto_tune_alpha_new(
+                    self.alpha_per_layer = self._auto_tune_alpha(
                         input_maxes_abs, calib_sample_num=32, **auto_alpha_args
                     )  ##save the alpha