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fchollet's profile
François Chollet
François Chollet
François Chollet
Verified account
@fchollet

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François CholletVerified account

@fchollet

Deep learning @google. Creator of Keras. Author of 'Deep Learning with Python'. Opinions are my own.

United States
fchollet.com
Joined August 2009

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    1. François Chollet‏Verified account @fchollet 19 Aug 2020

      A thing I hear sometimes: "what if my loss doesn't match the signature loss = fn(y_true, y_pred)?" This is not a requirement in Keras -- it's only the default setting. If you have a loss with multiple inputs/targets, here are your options, in order of preference: (a thread)

      3 replies 42 retweets 280 likes
      Show this thread
    2. François Chollet‏Verified account @fchollet 19 Aug 2020

      1. Use a layer that calls `self.add_loss(value)`. Docs: https://keras.io/api/losses/#the-addloss-api … And if you need access to labels, use the "endpoint layer" pattern: https://keras.io/examples/keras_recipes/endpoint_layer_pattern/ …

      1 reply 4 retweets 34 likes
      Show this thread
    3. François Chollet‏Verified account @fchollet 19 Aug 2020

      2. Override the `train_step` method of your Model class to implement your custom loss. Guide: https://keras.io/guides/customizing_what_happens_in_fit/ … A few examples: Metric learning: https://keras.io/examples/vision/metric_learning/ … Vanilla GAN: https://keras.io/examples/generative/dcgan_overriding_train_step/ … WGAN-GP: https://keras.io/examples/generative/wgan_gp/ … CycleGAN: https://keras.io/examples/generative/cyclegan/ …

      2 replies 6 retweets 54 likes
      Show this thread
    4. francesco lupo‏ @fra_liup 20 Aug 2020
      Replying to @fchollet

      How do I modify train_step if I need to handle a validation dataset? Do I need to write the full training loop from scratch?

      1 reply 0 retweets 0 likes
    5. François Chollet‏Verified account @fchollet 20 Aug 2020
      Replying to @fra_liup

      You override test_step too

      1 reply 0 retweets 0 likes
    6. francesco lupo‏ @fra_liup 20 Aug 2020
      Replying to @fchollet

      Aaah thanks! I did not know there was a test_step, cheers

      1 reply 0 retweets 0 likes
      François Chollet‏Verified account @fchollet 20 Aug 2020
      Replying to @fra_liup

      Check out the guide (link in tweet)

      11:42 AM - 20 Aug 2020
      1 reply 0 retweets 0 likes
        1. francesco lupo‏ @fra_liup 20 Aug 2020
          Replying to @fchollet

          I did and I completely missed that paragraph, long day... Thanks for the help!

          0 replies 0 retweets 0 likes
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