参考: 数据并行模式参考:https://github.com/normanheckscher/mnist-multi-gpu/blob/master/mnist_multi_gpu_batching_train.py 数据注入方式参考:https://github.com/golbin/TensorFlow-Multi-GPUs/blob/master/many-GPUs-MNIST.py https://gitee.com/liyang619/mnist_multi_gpu_batching_train/blob/master/mnist_multi_gpu_batching_train.py#