added calib_func check

Signed-off-by: Suguna Velury <178320438+sugunav14@users.noreply.github.com>

Author: sugunav14

modelopt/torch/quantization/mode.py

@@ -229,6 +229,9 @@ def wrapped_calib_func(
 
     if func is not None:
         if sequential:
+            assert method in ["max"], (
+                f"Sequential calibration currently only supports max calibration, got {method}"
+            )
             # Wrap with sequential processing
             sequential_calibrate(
                 model,