keras模型加载极慢 [英] Extremely slow model load with keras

问题描述

我有一套Keras模型(30)，我使用以下方法进行了训练和保存:

I have a set of Keras models (30) that I trained and saved using:

 model.save('model{0}.h5'.format(n_model))

当我尝试使用load_model加载它们时，每个模型所需的时间都非常大且需要增量.加载过程如下:

When I try to load them, using load_model, the time required for each model is quite large and incremental. The loading is done as:

models = {}
for i in range(30):
    start = time.time()
    models[i] = load_model('model{0}.h5'.format(ix)) 
    end = time.time()
    print "Model {0}: seconds {1}".format(ix, end - start)

输出为:

...
Model 9: seconds 7.38966012001
Model 10: seconds 9.99283003807
Model 11: seconds 9.7262301445
Model 12: seconds 9.17000102997
Model 13: seconds 10.1657290459
Model 14: seconds 12.5914049149
Model 15: seconds 11.652477026
Model 16: seconds 12.0126030445
Model 17: seconds 14.3402299881
Model 18: seconds 14.3761711121
...

每个模型都非常简单:2个隐藏层，每个都有10个神经元(大小约50Kb).为什么装载量如此之大，为什么时间会增加?我是否缺少某些内容(例如模型的关闭功能?)

Each model is really simple: 2 hidden layers with 10 neurons each (size ~50Kb). Why is the loading taking so much and why is the time increasing? Am I missing something (e.g. close function for the model?)

解决方案

我发现，加快模型的加载最好将网络的结构和权重存储到两个不同的文件中: 保存部分:

I found out that to speed up the loading of the model is better to store the structure of the networks and the weights into two distinct files: The saving part:

model.save_weights('model.h5')
model_json = model.to_json()
with open('model.json', "w") as json_file:
    json_file.write(model_json)
json_file.close()

加载部分:

from keras.models import model_from_json
json_file = open("model.json", 'r')
loaded_model_json = json_file.read()
json_file.close()
model = model_from_json(loaded_model_json)
model.load_weights("model.h5")

推荐答案

我通过在每次加载之前清除keras会话来解决了这个问题

I solved the problem by clearing the keras session before each load

from keras import backend as K
for i in range(...):
  K.clear_session()
  model = load_model(...)

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