Tuning the model parameters

It's time to try out different parameters on your model and see how well it performs!

The create_model() function you built in the previous exercise is ready for you to use.

Since fitting the RandomizedSearchCV object would take too long, the results you'd get are printed in the show_results() function. You could try random_search.fit(X,y) in the console yourself to check it does work after you have built everything else, but you will probably timeout the exercise (so copy your code first if you try this or you can lose your progress!).

You don't need to use the optional epochs and batch_size parameters when building your KerasClassifier object since you are passing them as params to the random search and this works already.

Cet exercice fait partie du cours

Introduction to Deep Learning with Keras

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Instructions

Import KerasClassifier from tensorflow.keras scikit_learn wrappers.
Use your create_model function when instantiating your KerasClassifier.
Set 'relu' and 'tanh' as activation, 32, 128, and 256 as batch_size, 50, 100, and 200 epochs, and learning_rate of 0.1, 0.01, and 0.001.
Pass your converted model and the chosen params as you build your RandomizedSearchCV object.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

# Import KerasClassifier from tensorflow.keras scikit learn wrappers
from tensorflow.keras.wrappers.____ import ____

# Create a KerasClassifier
model = KerasClassifier(build_fn = ____)

# Define the parameters to try out
params = {'activation': [____, ____], 'batch_size': [____, ____, ____], 
          'epochs': [____, ____, ____], 'learning_rate': [____, ____, ____]}

# Create a randomize search cv object passing in the parameters to try
random_search = RandomizedSearchCV(____, param_distributions = ____, cv = KFold(3))

# Running random_search.fit(X,y) would start the search,but it takes too long! 
show_results()

Modifier et exécuter le code

Cet exercice fait partie du cours

Introduction to Deep Learning with Keras

IntermédiaireNiveau de compétence

4.8+

Commencer le cours gratuitement

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?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

Exercice en cours

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!