!2365 fix parameter cast issue

Merge pull request !2365 from wangqiuliang/fix-parameter-cast-issue

mindspore/ops/operations/array_ops.py

@@ -28,6 +28,7 @@ from ..._checkparam import Validator as validator
 from ..._checkparam import Rel
 from ...common import dtype as mstype
 from ...common.tensor import Tensor
+from ...common.parameter import Parameter
 from ..operations.math_ops import _infer_shape_reduce
 from .._utils import get_concat_offset
 from ..primitive import Primitive, PrimitiveWithInfer, prim_attr_register, _run_op
@@ -186,11 +187,15 @@ class Cast(PrimitiveWithInfer):
         self.init_prim_io_names(inputs=['x', 'dst_type'], outputs=['output'])
 
     def check_elim(self, x, dtype):
-        if  isinstance(x, (Tensor, numbers.Number)):
+        if  isinstance(x, (Tensor, numbers.Number, Parameter)):
             if isinstance(x, Tensor) and x.dtype == dtype:
                 return (True, x)
             if isinstance(x, numbers.Number):
                 return (True, Tensor(x, dtype=dtype))
+            if isinstance(x, Parameter):
+                data = x.default_input
+                if data.dtype == dtype:
+                    return (True, x)
             return (False, None)
         raise ValueError(f"Expecting (Tensor, dtype), got : ({x}, {dtype})")