Preparing the data for training

In this exercise, you will continue to prepare the data to train the model. After creating the arrays of sentences and next characters, you need to transform them to numerical values that can be used on the model.

This step is necessary because the RNN models expect numbers only and not strings. You will create numerical arrays that have zeros or ones in the positions representing the characters present on the sentences. Ones (or True) represent the corresponding character is present, while zeros (or False) represent the absence of the character in that position of the sentence.

The variables sentences, next_char, n_vocab, chars_window, num_seqs (number of sentences in the training data) are already loaded in the environment, as well as numpy as np.

This exercise is part of the course

Recurrent Neural Networks (RNNs) for Language Modeling with Keras

Exercise instructions

Instantiate a np.array() with zeros and shape (number of sentences, characters window, vocabulary size).
Use the dictionary char_to_index to set the position of the current char to 1.
Set the current next character to 1.
Print the first position of each array.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Instantiate the variables with zeros
numerical_sentences = np.zeros((____, ____, ____), dtype=np.bool)
numerical_next_chars = np.zeros((num_seqs, n_vocab), dtype=np.bool)

# Loop for every sentence
for i, sentence in enumerate(sentences):
  # Loop for every character in sentence
  for t, char in enumerate(sentence):
    # Set position of the character to 1
    numerical_sentences[i, t, ____] = ____
    # Set next character to 1
    ____[i, char_to_index[next_chars[i]]] = 1

# Print the first position of each
print(____, ____, sep="\n")

Edit and Run Code

This exercise is part of the course

Recurrent Neural Networks (RNNs) for Language Modeling with Keras

AdvancedSkill Level

4.8+

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In this chapter, you will learn the foundations of Recurrent Neural Networks (RNN). Starting with some prerequisites, continuing to understanding how information flows through the network and finally seeing how to implement such models with Keras in the sentiment classification task.

Exercise 1: Introduction to the course Exercise 2: Comparing the number of parameter of RNN and ANN Exercise 3: Sentiment analysis Exercise 4: Sequence to sequence models Exercise 5: Introduction to language models Exercise 6: Getting used to text data Exercise 7: Preparing text data for model input Exercise 8: Transforming new text Exercise 9: Introduction to RNN inside Keras Exercise 10: Keras models Exercise 11: Keras preprocessing Exercise 12: Your first RNN model

You will learn about the vanishing and exploding gradient problems, often occurring in RNNs, and how to deal with them with the GRU and LSTM cells. Furthermore, you'll create embedding layers for language models and revisit the sentiment classification task.

Exercise 1: Vanishing and exploding gradients Exercise 2: Exploding gradient problem Exercise 3: Vanishing gradient problem Exercise 4: GRU and LSTM cells Exercise 5: GRU cells are better than simpleRNN Exercise 6: Stacking RNN layers Exercise 7: The Embedding layer Exercise 8: Number of parameters comparison Exercise 9: Transfer learning Exercise 10: Embeddings improves performance Exercise 11: Sentiment classification revisited Exercise 12: Better sentiment classification Exercise 13: Using the CNN layer

Next, in this chapter you will learn how to prepare data for the multi-class classification task, as well as the differences between multi-class classification and binary classification (sentiment analysis). Finally, you will learn how to create models and measure their performance with Keras.

Exercise 1: Data pre-processing Exercise 2: Prepare label vectors Exercise 3: Pre-process data Exercise 4: Transfer learning for language models Exercise 5: Transfer learning starting point Exercise 6: Word2Vec Exercise 7: Multi-class classification models Exercise 8: Exploring 20 News Groups dataset Exercise 9: Classifying news articles Exercise 10: Assessing the model's performance Exercise 11: Precision-Recall trade-off Exercise 12: Precision or Recall, that is the question Exercise 13: Performance on multi-class classification

This chapter introduces you to two applications of RNN models: Text Generation and Neural Machine Translation. You will learn how to prepare the text data to the format needed by the models. The Text Generation model is used for replicating a character's way of speech and will have some fun mimicking Sheldon from The Big Bang Theory. Neural Machine Translation is used for example by Google Translate in a much more complex model. In this chapter, you will create a model that translates Portuguese small phrases into English.

Exercise 1: Sequence to Sequence Models Exercise 2: Text generation examples Exercise 3: NMT example Exercise 4: The Text Generating Function Exercise 5: Predict next character Exercise 6: Generate sentence with context Exercise 7: Change the probability scale Exercise 8: Text Generation Models Exercise 9: Create vectors of sentences and next characters Exercise 10: Preparing the data for training

Current Exercise

Exercise 11: Creating the text generation model Exercise 12: Neural Machine Translation Exercise 13: Preparing the input text Exercise 14: Preparing the output text Exercise 15: Translate Portuguese to English Exercise 16: Congratulations!