Transfer the value of stop_gradient for feeding data. #4831
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图像分类模型中，当设置data_format=“NHWC”时，图像数据依旧按NCHW读进来，之后通过一个tranpose转换成NHWC格式。feed数据都是设置stop_gradient=True，直接传给conv2d，则该conv2d_grad不需要计算input_grad。插入transpose后，feed数据的stop_gradient属性没有传递给tranpose的输出变量，导致了conv2d_grad中产生了多余的计算（计算input_grad）。
这个PR将feed image的stop_gradient属性值传递给transpose的输出变量。