23 - Neural Word Embeddings
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Questions and Answers

What is the purpose of the learn a feature vector in neural networks for language modeling?

To represent the similarity between words

In the context of Continuous Bag of Words (CBOW), how are the input words used to predict the output word?

By summing the rows of every input word and finding the most similar column in the output.

What is the main idea behind Skip-Gram with Negative Sampling (SGNS) in neural networks for language modeling?

To use neighbor words to predict the target word.

How can we interpret the relationship between words in skip-gram model?

<p>As related to pointwise mutual information.</p> Signup and view all the answers

What is the loss function used in Continuous Bag of Words (CBOW) for word2vec?

<p>Probability of word given context.</p> Signup and view all the answers

What is the loss function used in Skip-Gram for word2vec?

<p>Probability of context given word.</p> Signup and view all the answers

What are two methods to approximate softmax for performance reasons?

<p>Hierarchical softmax or negative sampling</p> Signup and view all the answers

How can we optimize the weights in Skip-Gram model?

<p>Using stochastic gradient descent and back-propagation</p> Signup and view all the answers

In Skip-Gram model, what is updated with a learning rate during optimization?

<p>The rows of the matrix where and</p> Signup and view all the answers

What is the purpose of negative sampling in Skip-Gram optimization?

<p>To make the 'bad' output vectors less similar to the computed output</p> Signup and view all the answers

What is the objective of skip-gram model when all word cooccurrences are aggregated into a matrix?

<p>To minimize the loss function</p> Signup and view all the answers

In the context of word2vec to Paragraph Vectors, what is the suggested approach to improve representation?

<p>Include the document in the vector representation</p> Signup and view all the answers

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