modify act ulq min/max grad type

mindspore/ops/operations/_quant_ops.py

@@ -44,7 +44,12 @@ __all__ = ["MinMaxUpdatePerLayer",
            "BatchNormFold2_D",
            "BatchNormFold2GradD",
            "BatchNormFold2GradReduce",
-           "IFMR"
+           "IFMR",
+           "ActsULQ",
+           "ActsULQInputGrad",
+           "ActULQClampMinGrad",
+           "ActULQClampMaxGrad",
+           "WtsARQ"
            ]
 
 
@@ -1300,7 +1305,7 @@ class ActULQClampMinGrad(PrimitiveWithInfer):
         return tuple(output_shape)
 
     def infer_dtype(self, input_x, input_y, input_z):
-        return input_x
+        return mstype.float32
 
 
 class ActULQClampMaxGrad(PrimitiveWithInfer):
@@ -1337,7 +1342,7 @@ class ActULQClampMaxGrad(PrimitiveWithInfer):
         return tuple(output_shape)
 
     def infer_dtype(self, input_x, input_y, input_z):
-        return input_x
+        return mstype.float32
 
 
 class WtsARQ(PrimitiveWithInfer):