保存的文件有4个：
checkpoint
model-parameters.bin-46000.data-00000-of-00001
model-parameters.bin-46000.index
model-parameters.bin-46000.meta
读取代码：
from tensorflow.python import pywrap_tensorflow
with tf.Graph().as_default():
with tf.Session() as sess:
ckpt = tf.train.get_checkpoint_state('./checkpoint')
if ckpt and ckpt.model_checkpoint_path:
reader = pywrap_tensorflow.NewCheckpointReader('./checkpoint/model-parameters.bin-46000')
all_variables = reader.get_variable_to_shape_map()
w1 = reader.get_tensor("conv1/weight")
print(w1.shape)
print(w1)
print(all_variables)
else:
print('No checkpoint file found')