Confusion about keras Model: __call__ vs. call vs. predict methods

Adding to @Dmitry Kabanov, they are similar yet they aren’t exactly the same thing. If you care about performance, need to look in to critical differences between them. model.predict model(x) loops over the data in batches which means means that predict() calls can scale to very large arrays. happens in-memory and doesn’t scale not differentiable … Read more

Implementing skip connections in keras

The easy answer is don’t use a sequential model for this, use the functional API instead, implementing skip connections (also called residual connections) are then very easy, as shown in this example from the functional API guide: from keras.layers import merge, Convolution2D, Input # input tensor for a 3-channel 256×256 image x = Input(shape=(3, 256, … Read more

Keras replacing input layer

When you saved your model using: old_model.save(‘my_model.h5’) it will save following: The architecture of the model, allowing to create the model. The weights of the model. The training configuration of the model (loss, optimizer). The state of the optimizer, allowing training to resume from where you left before. So then, when you load the model: … Read more

ImportError: cannot import name ‘_obtain_input_shape’ from keras

You don’t have to downgrade Keras 2.2.2. In Keras 2.2.2 there is no _obtain_input_shape method in the keras.applications.imagenet_utils module. You can find it under keras-applications with the modul name keras_applications (underscore). So you don’t have to downgrade your Keras to 2.2.0 just change: from keras.applications.imagenet_utils import _obtain_input_shape to from keras_applications.imagenet_utils import _obtain_input_shape

Create keras callback to save model predictions and targets for each batch during training

NOTE: this answer is outdated and only works with TF1. Check @bers’s answer for a solution tested on TF2. After model compilation, the placeholder tensor for y_true is in model.targets and y_pred is in model.outputs. To save the values of these placeholders at each batch, you can: First copy the values of these tensors into … Read more

Early stopping with Keras and sklearn GridSearchCV cross-validation

[Answer after the question was edited & clarified:] Before rushing into implementation issues, it is always a good practice to take some time to think about the methodology and the task itself; arguably, intermingling early stopping with the cross validation procedure is not a good idea. Let’s make up an example to highlight the argument. … Read more

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