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I am working on the development of a deep learning model for prediction of a disease from medical images. It is a binary classification algorithm. I am currently using a model built from scratch with a quite traditional architecture of several convolutional, pooling and batch normalization layers, followed by a fully connected network.

The model fits the training data well (with obvious overfitting). The loss of both the training and validation decrease over the epochs at a similar rate. The accuracy for training is close to 1 after 200 epochs, however the accuracy for validation stabilizes to approximately 0.6 after ~20 epochs. See the image below.

Any idea how to optimize? I have tried to fine-tune a lot of different hyperparameters (drop out rates, loss functions, activation functions, regularization, learning rate, et cetera) but can't seem to optimize it any further at this point.

Your input would be highly appreciated!

enter image description here

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  • $\begingroup$ How are you calculating the training and validation losses? $\endgroup$ – Ruben van Bergen Jul 18 '19 at 19:55
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    $\begingroup$ Both plots show that the metrics stabilize at some point, better for train then validation sets. They show that your model is overfitting. $\endgroup$ – Tim Jul 18 '19 at 20:48
  • $\begingroup$ I believe it is indeed an issue of overfitting given the relatively small amount of data. Now playing around with transfer learning from pre-trained ImageNet networks and I am already seeing better performance. Thanks! $\endgroup$ – DeepLearningStef Jul 19 '19 at 20:05