replace to_affine_quantized_floatx with to_affine_quantized_float8 in…

… quantization APIs

ghstack-source-id: 059b6978da29d45ed55481b0c510231f2ad93303
ghstack-comment-id: 2608105249
Pull Request resolved: #1599

torchao/quantization/quant_api.py

@@ -36,6 +36,7 @@
     SemiSparseLayout,
     TensorCoreTiledLayout,
     UintxLayout,
+    to_affine_quantized_float8,
     to_affine_quantized_floatx,
     to_affine_quantized_floatx_static,
     to_affine_quantized_intx,
@@ -66,21 +67,13 @@
     Int8DynActInt4WeightGPTQQuantizer,
     Int8DynActInt4WeightQuantizer,
 )
-from .granularity import (
-    PerRow,
-    PerTensor,
-)
+from .granularity import PerRow, PerTensor
 from .linear_activation_quantized_tensor import (
     LinearActivationQuantizedTensor,
     to_linear_activation_quantized,
 )
-from .qat import (
-    intx_quantization_aware_training,
-)
-from .quant_primitives import (
-    MappingType,
-    ZeroPointDomain,
-)
+from .qat import intx_quantization_aware_training
+from .quant_primitives import MappingType, ZeroPointDomain
 from .subclass import (
     Int4WeightOnlyQuantizedLinearWeight,
     Int8DynamicallyQuantizedLinearWeight,
@@ -915,10 +908,12 @@ def int8_dynamic_activation_int8_semi_sparse_weight():
     Applies int8 dnynamic symmetric per-token activation and int8 per-channel weight
     quantization + 2:4 sparsity to linear layers.
     """
-    warnings.warn("""int8_dyanmic_activation_int8_semi_sparse_weight() will be deprecated at a later release. Please use the layout kwarg in int8_dynamic_activation_int8_weight instead.
+    warnings.warn(
+        """int8_dyanmic_activation_int8_semi_sparse_weight() will be deprecated at a later release. Please use the layout kwarg in int8_dynamic_activation_int8_weight instead.
 
     from torchao.dtypes import SemiSparseLayout
-    int8_dynamic_activation_int8_weight(layout=SemiSparseLayout()""")
+    int8_dynamic_activation_int8_weight(layout=SemiSparseLayout()"""
+    )
 
     return int8_dynamic_activation_int8_weight(layout=SemiSparseLayout())
 
@@ -934,15 +929,13 @@ def float8_weight_only(weight_dtype: torch.dtype = torch.float8_e4m3fn):
         The actual matmul will be computed in original precision of the weight tensor.
 
     """
-    from torchao.dtypes import to_affine_quantized_floatx
 
     def apply_float8wo_quant(weight):
         block_size = (1, weight.shape[1])
-        return to_affine_quantized_floatx(
+        return to_affine_quantized_float8(
             input_float=weight,
             block_size=block_size,
             target_dtype=weight_dtype,
-            scale_dtype=None,
             _layout=Float8Layout(mm_config=None),
         )
 
@@ -1016,11 +1009,10 @@ def _input_activation_quant_func_fp8(
 
     block_size = get_block_size(x.shape, activation_granularity)
     if scale is None:
-        activation = to_affine_quantized_floatx(
+        activation = to_affine_quantized_float8(
             input_float=x,
             block_size=block_size,
             target_dtype=activation_dtype,
-            scale_dtype=torch.float32,
             _layout=Float8Layout(mm_config=None),  # Config is stored on weight
         )
     else:
@@ -1102,11 +1094,10 @@ def apply_float8_dynamic_activation_quant(weight: torch.Tensor):
             ), "PerRow quantization only works for bfloat16 precision input weight"
 
         block_size = get_block_size(weight.shape, weight_granularity)
-        quantized_weight = to_affine_quantized_floatx(
+        quantized_weight = to_affine_quantized_float8(
             input_float=weight,
             block_size=block_size,
             target_dtype=weight_dtype,
-            scale_dtype=torch.float32,
             _layout=Float8Layout(mm_config=mm_config),
         )