Feat (nn): avoid computing output scale/zp when not needed

Xilinx · Jul 4, 2023 · 2b6c162 · 2b6c162
1 parent 4995a6a
commit 2b6c162
Showing 1 changed file with 11 additions and 6 deletions.
diff --git a/src/brevitas/nn/quant_layer.py b/src/brevitas/nn/quant_layer.py
@@ -310,12 +310,17 @@ def forward_impl(self, inp: Union[Tensor, QuantTensor]) -> Union[Tensor, QuantTe
         quant_input = self.input_quant(inp)
         quant_weight = self.quant_weight(quant_input)
 
-        if quant_input.bit_width is not None and quant_weight.bit_width is not None:
-            output_bit_width = self.max_acc_bit_width(quant_input.bit_width, quant_weight.bit_width)
-        if quant_input.scale is not None and quant_weight.scale is not None:
-            output_scale = self.quant_output_scale_impl(inp, quant_input.scale, quant_weight.scale)
-        if quant_input.signed is not None:
-            output_signed = inp.signed or quant_weight.signed
+        if (self.return_quant_tensor or
+            (self.is_bias_quant_enabled and
+             (self.bias_quant.requires_input_scale or self.bias_quant.requires_input_bit_width))):
+            if quant_input.bit_width is not None and quant_weight.bit_width is not None:
+                output_bit_width = self.max_acc_bit_width(
+                    quant_input.bit_width, quant_weight.bit_width)
+            if quant_input.scale is not None and quant_weight.scale is not None:
+                output_scale = self.quant_output_scale_impl(
+                    inp, quant_input.scale, quant_weight.scale)
+            if quant_input.signed is not None:
+                output_signed = inp.signed or quant_weight.signed
 
         if self.bias is not None:
             quant_bias = self.bias_quant(self.bias, output_scale, output_bit_width)