fix IsInstance op bug when input is tensor

mindspore/core/ir/dtype/tensor_type.cc

@@ -64,7 +64,9 @@ bool UndeterminedType::operator==(const Type &other) const {
 }
 
 TypePtr TensorType::DeepCopy() const {
-  MS_EXCEPTION_IF_NULL(element_type_);
+  if (element_type_ == nullptr) {
+    return std::make_shared<TensorType>();
+  }
   if (IsGeneric()) {
     return std::make_shared<TensorType>();
   }

mindspore/ops/operations/array_ops.py

@@ -347,7 +347,8 @@ class IsInstance(PrimitiveWithInfer):
         sub_type_t = inst['dtype']
         type_v = type_['value']
 
-        validator.check_const_input("inst", inst['value'], self.name)
+        if not isinstance(inst, type(mstype.tensor)):
+            validator.check_const_input("inst", inst['value'], self.name)
         validator.check_value_type("type_", type_v, [mstype.Type], self.name)
 
         if type_v == mstype.list_: