Update number of groups (#178)

* set num_groups to 1 if if < 1

* Update src/compressed_tensors/quantization/lifecycle/initialize.py

Co-authored-by: Kyle Sayers <[email protected]>

---------

Co-authored-by: Kyle Sayers <[email protected]>

Author: dsikka

src/compressed_tensors/quantization/lifecycle/initialize.py

@@ -172,9 +172,10 @@ def _initialize_scale_zero_point_observer(
             # (output_channels, 1)
             expected_shape = (weight_shape[0], 1)
         elif quantization_args.strategy == QuantizationStrategy.GROUP:
+            num_groups = weight_shape[1] // quantization_args.group_size
             expected_shape = (
                 weight_shape[0],
-                weight_shape[1] // quantization_args.group_size,
+                max(num_groups, 1)
             )
 
     scale_dtype = module.weight.dtype