防止占用GPU
import os
os.environ["CUDA_VISIBLE_DEVICES"] = "1"
import tensorflow as tf
config = tf.ConfigProto()
config.gpu_options.allow_growth = True
#config.gpu_options.per_process_gpu_memory_fraction = 0.3
#set_session(tf.Session(config=config))
session = tf.Session(config=config)
import keras