Added the dynamic check in the validator

Author: cehongwang

py/torch_tensorrt/dynamo/conversion/aten_ops_converters.py

@@ -25,6 +25,7 @@
     get_positive_dim,
     is_only_operator_on_placeholder,
 )
+from torch_tensorrt.dynamo.utils import DYNAMIC_DIM
 
 _LOGGER: logging.Logger = logging.getLogger(__name__)
 
@@ -2721,6 +2722,13 @@ def sort_validator(node: Node, settings: Optional[CompilationSettings] = None) -
 
 
 def topk_sort_validator(k: int) -> bool:
+
+    # topk layer supports dynamic k value but we cannot determine supported dynamic topk value at
+    # compile time.
+    if k == DYNAMIC_DIM:
+        _LOGGER.debug("k value cannot be dynamic!")
+        return False
+
     if k > 3840:
         _LOGGER.debug(
             f"Currently only topk values up to 3840 are supported, got k={k}."