Keras保存检查站
[英]Keras save checkpoints
问题描述
I am following this blog and I am having trouble to implement saving checkpoints as it's used in linked blog. 
我正在关注这个博客 ，我很难实现保存检查点，因为它在链接博客中使用。 At line 23 it used: 第23行使用：
filepath="weights-improvement-{epoch:02d}-{val_acc:.2f}.hdf5" . filepath="weights-improvement-{epoch:02d}-{val_acc:.2f}.hdf5" 。
So I tried to tweak the code a little bit to be more dynamic: 所以我尝试稍微调整代码以使其更具动态性：
filepath = '{0}/checkpoints/checkpoint-{epoch:02d}-{val_loss:.2f}.hdf5'.format(directory) . filepath = '{0}/checkpoints/checkpoint-{epoch:02d}-{val_loss:.2f}.hdf5'.format(directory) 。
Where I want to store all checkpoints of given architecture in 1 directory, eg: ./architecture1/checkpoints/ 我想在1个目录中存储给定体系结构的所有检查点，例如： ./architecture1/checkpoints/
But I get the following error: KeyError: 'epoch' . 但是我收到以下错误： KeyError: 'epoch' 。 What am I doing wrong here? 我在这做错了什么？
PS: filepath = "./checkpoints/checkpoint-{epoch:02d}-{val_loss:.2f}.hdf5" works, but it saves all checkpoints in 1 directory which I don't want. PS： filepath = "./checkpoints/checkpoint-{epoch:02d}-{val_loss:.2f}.hdf5" checkpoint/checkpoint- filepath = "./checkpoints/checkpoint-{epoch:02d}-{val_loss:.2f}.hdf5" : filepath = "./checkpoints/checkpoint-{epoch:02d}-{val_loss:.2f}.hdf5" : filepath = "./checkpoints/checkpoint-{epoch:02d}-{val_loss:.2f}.hdf5"有效，但它将所有检查点保存在我不想要的1个目录中。
2 个解决方案
解决方案1
2 已采纳 2017-07-04 05:07:31
If you want to use format , the proper way is to escape the brackets like this: 如果你想使用format ，正确的方法是逃避括号，如下所示：
filepath = '{0}/checkpoints/checkpoint-{{epoch:02d}}-{{val_loss:.2f}}.hdf5'.format(directory)
So if directory = 'weights' , filepath would be 'weights/checkpoints/checkpoint-{epoch:02d}-{val_loss:.2f}.hdf5' . 因此，如果directory = 'weights' ， filepath将是'weights/checkpoints/checkpoint-{epoch:02d}-{val_loss:.2f}.hdf5' 。
(Take care if directory contains {} ) （如果directory包含{}请注意）
解决方案2
1 2017-07-04 05:22:04
The problem is that you are using format on a format eligible string but supply only one of the keys - and that causes an error. 问题是您在符合format字符串上使用format但只提供其中一个键 - 这会导致错误。
What you are doing is 你在做什么
"{0} some text here {epoch:02d}".format("text")
and that is causing an error, because it looks for the second key and can't find it. 这导致错误，因为它查找第二个键，但找不到它。
If you want your code to be dynamic, what I would do is: 如果您希望您的代码是动态的，我会做的是：
"{0}".format(directory) + "/checkpoints/checkpoint-{epoch:02d}-{val_loss:.2f}.hdf5"
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