[TensorRT] Fix pad_value access (removed from PadAttrs) (#9858)

Author: masahi

python/tvm/relay/op/contrib/tensorrt.py

@@ -737,14 +737,17 @@ def pad_annotate_fn(expr):  # pylint: disable=unused-variable
     """Check if nn.pad is supported by TensorRT."""
 
     attrs, args = expr.attrs, expr.args
+    pad_value = args[1]
+    assert isinstance(pad_value, relay.Constant)
+    pad_value = pad_value.data.numpy().item()
     if any([x.checked_type.dtype != "float32" for x in args]):
         logger.info("Only float32 inputs are supported for TensorRT.")
         return False
     if attrs.pad_mode != "constant":
         logger.info("nn.pad: pad mode is %s but must be constant.", attrs.pad_mode)
         return False
-    if float(attrs.pad_value) != 0.0:
-        logger.info("nn.pad: pad value is %f but must be 0.0.", float(attrs.pad_value))
+    if pad_value > 0.0:
+        logger.info("nn.pad: pad value is %f but must be 0.0.", pad_value)
         return False
     if len(attrs.pad_width) not in [4, 5]:
         logger.info("nn.pad: can only pad 4D or 5D inputs")