Minor fix for logical operators precedence in _aqt_is_* checks.

Author: alexsamardzic

torchao/dtypes/affine_quantized_tensor.py

@@ -1119,24 +1119,24 @@ def _aqt_is_int8(aqt):
     """Check if an AffineQuantizedTensor is int8 quantized Tensor"""
     return (
         aqt.layout_tensor.dtype == torch.int8 and
-        aqt.quant_min is None or aqt.quant_min == -128 and
-        aqt.quant_max is None or aqt.quant_max == 127
+        (aqt.quant_min is None or aqt.quant_min == -128) and
+        (aqt.quant_max is None or aqt.quant_max == 127)
     )
 
 def _aqt_is_int8_reduced_range(aqt):
     return (
         aqt.layout_tensor.dtype == torch.int8 and
-        aqt.quant_min == -127 and
-        aqt.quant_max is None or aqt.quant_max == 127
+        (aqt.quant_min is not None and aqt.quant_min == -127) and
+        (aqt.quant_max is None or aqt.quant_max == 127)
     )
 
 def _aqt_is_uint4(aqt):
     """Check if an AffineQuantizedTensor is uint4 quantized Tensor"""
     # TODO: use torch.uint4
     return (
         aqt.layout_tensor.dtype == torch.int32 and
-        aqt.quant_min is None or aqt.quant_min == 0 and
-        aqt.quant_max is None or aqt.quant_max == 15
+        (aqt.quant_min is not None and aqt.quant_min == 0) and
+        (aqt.quant_max is not None and aqt.quant_max == 15)
     )