make preset more explicit (#105)

Author: Sara Adkins

src/compressed_tensors/quantization/quant_scheme.py

@@ -17,6 +17,7 @@
 
 from compressed_tensors.quantization.quant_args import (
     QuantizationArgs,
+    QuantizationStrategy,
     QuantizationType,
 )
 from pydantic import BaseModel
@@ -110,15 +111,55 @@ def is_preset_scheme(name: str) -> bool:
     return name.upper() in PRESET_SCHEMES
 
 
-W8A8 = dict(weights=QuantizationArgs(), input_activations=QuantizationArgs())
+W8A8 = dict(
+    weights=QuantizationArgs(
+        num_bits=8,
+        symmetric=True,
+        type=QuantizationType.INT,
+        strategy=QuantizationStrategy.CHANNEL,
+    ),
+    input_activations=QuantizationArgs(
+        num_bits=8,
+        symmetric=True,
+        type=QuantizationType.INT,
+        strategy=QuantizationStrategy.TOKEN,
+        dynamic=True,
+    ),
+)
 
-W4A16 = dict(weights=QuantizationArgs(num_bits=4, group_size=128))
+W8A16 = dict(
+    weights=QuantizationArgs(
+        num_bits=8,
+        symmetric=True,
+        type=QuantizationType.INT,
+        strategy=QuantizationStrategy.CHANNEL,
+    )
+)
 
-FP8 = dict(
-    weights=QuantizationArgs(type=QuantizationType.FLOAT),
-    input_activations=QuantizationArgs(type=QuantizationType.FLOAT),
+W4A16 = dict(
+    weights=QuantizationArgs(
+        num_bits=4,
+        symmetric=True,
+        type=QuantizationType.INT,
+        strategy=QuantizationStrategy.GROUP,
+        group_size=128,
+    )
 )
 
-PRESET_SCHEMES = {"W8A8": W8A8, "W4A16": W4A16, "FP8": FP8}
+FP8 = dict(
+    weights=QuantizationArgs(
+        num_bits=8,
+        symmetric=True,
+        type=QuantizationType.FLOAT,
+        strategy=QuantizationStrategy.TENSOR,
+    ),
+    input_activations=QuantizationArgs(
+        num_bits=8,
+        symmetric=True,
+        type=QuantizationType.FLOAT,
+        strategy=QuantizationStrategy.TENSOR,
+        dynamic=False,
+    ),
+)
 
-PRESET_SCHEMES = {"W8A8": W8A8, "W4A16": W4A16, "FP8": FP8}
+PRESET_SCHEMES = {"W8A8": W8A8, "W8A16": W8A16, "W4A16": W4A16, "FP8": FP8}

tests/test_quantization/test_quant_config.py

@@ -63,10 +63,7 @@ def test_need_config_groups():
 
 @pytest.mark.parametrize(
     "scheme_name",
-    [
-        "W8A8",
-        "W4A16",
-    ],
+    ["W8A8", "W8A16", "W4A16", "FP8"],
 )
 def test_load_scheme_from_preset(scheme_name: str):
     targets = ["Linear"]