Do we need more data?

It's time to check whether the digits dataset model you built benefits from more training examples!

In order to keep code to a minimum, various things are already initialized and ready to use:

The model you just built.
X_train,y_train,X_test, and y_test.
The initial_weights of your model, saved after using model.get_weights().
A pre-defined list of training sizes: training_sizes.
A pre-defined early stopping callback monitoring loss: early_stop.
Two empty lists to store the evaluation results: train_accs and test_accs.

Train your model on the different training sizes and evaluate the results on X_test. End by plotting the results with plot_results().

The full code for this exercise can be found on the slides!

Cet exercice fait partie du cours

Introduction to Deep Learning with Keras

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Instructions

Get a fraction of the training data determined by the size we are currently evaluating in the loop.
Set the model weights to the initial_weights with set_weights() and train your model on the fraction of training data using early_stop as a callback.
Evaluate and store the accuracy for the training fraction and the test set.
Call plot_results() passing in the training and test accuracies for each training size.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

for size in training_sizes:
  	# Get a fraction of training data (we only care about the training data)
    X_train_frac, y_train_frac = X_train[:size], y_train[:size]

    # Reset the model to the initial weights and train it on the new training data fraction
    model.set_weights(____)
    model.fit(X_train_frac, y_train_frac, epochs = 50, callbacks = [early_stop])

    # Evaluate and store both: the training data fraction and the complete test set results
    train_accs.append(model.evaluate(____, ____)[1])
    test_accs.append(model.evaluate(____, ____)[1])
    
# Plot train vs test accuracies
plot_results(____, ____)

Modifier et exécuter le code

Cet exercice fait partie du cours

Introduction to Deep Learning with Keras

IntermédiaireNiveau de compétence

4.8+

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In this first chapter, you will get introduced to neural networks, understand what kind of problems they can solve, and when to use them. You will also build several networks and save the earth by training a regression model that approximates the orbit of a meteor that is approaching us!

Exercise 1: What is Keras?Exercise 2: Describing Keras Exercise 3: Would you use deep learning?Exercise 4: Your first neural network Exercise 5: Hello nets!Exercise 6: Counting parameters Exercise 7: Build as shown!Exercise 8: Surviving a meteor strike Exercise 9: Specifying a model Exercise 10: Training Exercise 11: Predicting the orbit!

By the end of this chapter, you will know how to solve binary, multi-class, and multi-label problems with neural networks. All of this by solving problems like detecting fake dollar bills, deciding who threw which dart at a board, and building an intelligent system to water your farm. You will also be able to plot model training metrics and to stop training and save your models when they no longer improve.

Exercise 1: Binary classification Exercise 2: Exploring dollar bills Exercise 3: A binary classification model Exercise 4: Is this dollar bill fake ?Exercise 5: Multi-class classification Exercise 6: A multi-class model Exercise 7: Prepare your dataset Exercise 8: Training on dart throwers Exercise 9: Softmax predictions Exercise 10: Multi-label classification Exercise 11: An irrigation machine Exercise 12: Training with multiple labels Exercise 13: Keras callbacks Exercise 14: The history callback Exercise 15: Early stopping your model Exercise 16: A combination of callbacks

In the previous chapters, you've trained a lot of models! You will now learn how to interpret learning curves to understand your models as they train. You will also visualize the effects of activation functions, batch-sizes, and batch-normalization. Finally, you will learn how to perform automatic hyperparameter optimization to your Keras models using sklearn.

Exercise 1: Learning curves Exercise 2: Learning the digits Exercise 3: Is the model overfitting?Exercise 4: Do we need more data?

Exercice en cours

Exercise 5: Activation functions Exercise 6: Different activation functions Exercise 7: Comparing activation functions Exercise 8: Comparing activation functions II Exercise 9: Batch size and batch normalization Exercise 10: Changing batch sizes Exercise 11: Batch normalizing a familiar model Exercise 12: Batch normalization effects Exercise 13: Hyperparameter tuning Exercise 14: Preparing a model for tuning Exercise 15: Tuning the model parameters Exercise 16: Training with cross-validation

It's time to get introduced to more advanced architectures! You will create an autoencoder to reconstruct noisy images, visualize convolutional neural network activations, use deep pre-trained models to classify images and learn more about recurrent neural networks and working with text as you build a network that predicts the next word in a sentence.

Exercise 1: Tensors, layers, and autoencoders Exercise 2: It's a flow of tensors Exercise 3: Neural separation Exercise 4: Building an autoencoder Exercise 5: De-noising like an autoencoder Exercise 6: Intro to CNNs Exercise 7: Building a CNN model Exercise 8: Looking at convolutions Exercise 9: Preparing your input image Exercise 10: Using a real world model Exercise 11: Intro to LSTMs Exercise 12: Text prediction with LSTMs Exercise 13: Build your LSTM model Exercise 14: Decode your predictions Exercise 15: Test your model!Exercise 16: You're done!