conv2d bp input stride len 2 to len 4

mindspore/ops/operations/nn_ops.py

@@ -1084,7 +1084,7 @@ class Conv2DBackpropInput(PrimitiveWithInfer):
         self.init_prim_io_names(inputs=['out_backprop', 'filter', 'input_sizes'], outputs=['output'])
         self.out_channel = validator.check_integer('out_channel', out_channel, 0, Rel.GT, self.name)
         self.kernel_size = _check_positive_int_or_tuple('kernel_size', kernel_size, self.name)
-        self.stride = _check_positive_int_or_tuple('stride', stride, self.name, allow_four=True, ret_four=False)
+        self.stride = _check_positive_int_or_tuple('stride', stride, self.name, allow_four=True, ret_four=True)
         self.add_prim_attr('stride', self.stride)
         self.dilation = _check_positive_int_or_tuple('dilation', dilation, self.name, allow_four=True, ret_four=True)
         self.add_prim_attr('dilation', self.dilation)