[Quantization] Allow dynamic group activation quantization (#450)

* allow-group-dynamic-quantization

Signed-off-by: Kyle Sayers <[email protected]>

* satisfy quality checker

Signed-off-by: Kyle Sayers <[email protected]>

* more clear

Signed-off-by: Kyle Sayers <[email protected]>

---------

Signed-off-by: Kyle Sayers <[email protected]>

Author: kylesayrs

src/compressed_tensors/quantization/quant_scheme.py

@@ -63,9 +63,19 @@ def validate_model_after(model: "QuantizationScheme") -> "QuantizationScheme":
             if inputs.strategy not in (
                 QuantizationStrategy.TOKEN,
                 QuantizationStrategy.TENSOR,
+                QuantizationStrategy.GROUP,
                 QuantizationStrategy.TENSOR_GROUP,
             ):
-                raise ValueError(
+                if (
+                    inputs.strategy == QuantizationStrategy.GROUP
+                    and inputs.dynamic is True
+                ):
+                    raise NotImplementedError(
+                        "Static and local group-wise activation "
+                        "quantization is not supported"
+                    )
+
+                raise NotImplementedError(
                     f"Using {inputs.strategy} strategy is not supported for "
                     "activation quantization"
                 )