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Defining some Utility Functions

  • We shall define 3 utility functions which we will be using further:

    • rounded_accuracy: we define this function to get the rounded accuracy by calculating the accuracies using the rounded values of the predicted value and the actual value.

    • plot_image : used to plot the given image

    • show_reconstructions : we shall use this function to show how our trained model is able to reconstruct the validation data.

Note:

  • keras.metrics.binary_accuracy : calculates how often predictions matches binary labels. It computes the mean accuracy rate across all predictions for binary classification problems.

  • plt.imshow : Display data as an image

  • plt.axis("off") : It does not display the axis.

  • plt.subplot : Add a subplot to the current figure.

INSTRUCTIONS
  • Define the rounded_accuracy:

    def rounded_accuracy(y_true, y_pred):
        return keras.metrics.binary_accuracy(tf.round(y_true), tf.round(y_pred))
    
  • Define the plot_image function:

    def plot_image(image):
        plt.imshow(image, cmap="binary")
        plt.axis("off")
    
  • Define the show_reconstructions:

    def show_reconstructions(model, images=X_valid, n_images=5):
        reconstructions = model.predict(images[:n_images])
        fig = plt.figure(figsize=(n_images * 1.5, 3))
        for image_index in range(n_images):
            plt.subplot(2, n_images, 1 + image_index)
            plot_image(images[image_index])
            plt.subplot(2, n_images, 1 + n_images + image_index)
            plot_image(reconstructions[image_index])
    

    Here, we are doing the following:

    1. we are getting the reconstructions as predicted by the model.
    2. we are creating a matplotlib figure object and setting its size to (n_images * 1.5, 3), ie (5 * 1.5, 3)
    3. Nextly, for each of the n_images, we are creating the subplots and displaying the images in those subplots: the first row will display actual images and the second row will display the predicted images. The indices are set accordingly. Please have a look at the below image and check the indices used in the subplots to get a better understanding:

    enter image description here


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