7. Deep Learning and Variants_Lecture 6_20240204 - Neural Network Optimization Techniques
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Questions and Answers

What is the purpose of an input x in a Multi-Layer Perceptron (MLP)?

  • Determining the number of layers
  • Activating the hidden layers
  • Storing the output values
  • Representing the data fed into the model (correct)
  • In the context of an autoencoder, what does the target or output y typically represent?

  • Learning rate
  • Optimization algorithm
  • Activation function
  • Classification/regression label (correct)
  • What is the primary purpose of a vanilla autoencoder in terms of dimensionality reduction?

  • Moving data to a higher dimensional space
  • Expanding data dimensions
  • Maintaining the same dimensionality
  • Moving data to a lower dimensional hidden space (correct)
  • When data is squeezed through a bottleneck and reconstructed on the other side in an autoencoder, what process is being described?

    <p>Dimensionality reduction</p> Signup and view all the answers

    How many dimensions were achieved through the dimensionality reduction process using the MNIST dataset in the given context?

    <p>32 dimensions</p> Signup and view all the answers

    What is the key outcome when reducing the dimensionality of input data using an autoencoder?

    <p>Capturing essential information with fewer dimensions</p> Signup and view all the answers

    What is an important aspect of improving performance, according to the text?

    <p>Experimenting with various hyperparameters</p> Signup and view all the answers

    Which activation function is recommended in the text for better performance?

    <p>Leaky ReLU</p> Signup and view all the answers

    What is the purpose of dropout in neural networks as mentioned in the text?

    <p>Enhancing model generalization</p> Signup and view all the answers

    Which unsupervised learning models are popular according to the text?

    <p>Restricted Boltzmann Machines and Autoencoders</p> Signup and view all the answers

    What is the purpose of normalizing the data with a zero mean in pre-processing?

    <p>To allow more flexibility for the classifier</p> Signup and view all the answers

    What role do autoencoders play according to the text?

    <p>Reducing dimensionality of data</p> Signup and view all the answers

    How does the summation operation impact zero centricity normalization?

    <p>It destroys zero centricity</p> Signup and view all the answers

    Which technique is used for regularization in neural networks based on the information provided?

    <p>L1 regularization</p> Signup and view all the answers

    When is batch normalization applied in a neural network model?

    <p>After activation</p> Signup and view all the answers

    What is computed for every mini-batch during batch normalization?

    <p>Mean and variance</p> Signup and view all the answers

    How does batch normalization impact the training steps required for image classification models?

    <p>Reduces training steps significantly</p> Signup and view all the answers

    Why is batch normalization considered beneficial for neural network models?

    <p>It simplifies training and enhances model accuracy</p> Signup and view all the answers

    What is one of the solutions presented in the text to address the vanishing gradient problem in deep neural networks?

    <p>Better Activation functions</p> Signup and view all the answers

    Which technique mentioned in the text helps prevent overfitting in artificial neural networks by adding noise during training?

    <p>Dropout</p> Signup and view all the answers

    What issue does Weight initialization aim to tackle in the context of deep neural networks?

    <p>Gradient vanishing</p> Signup and view all the answers

    In the context of deep learning, what is one purpose of L1 and L2 regularization techniques?

    <p>Address overfitting by penalizing large weights</p> Signup and view all the answers

    How does Batch Normalization contribute to the training of deep neural networks?

    <p>It helps stabilize and speed up training by normalizing the outputs of each layer</p> Signup and view all the answers

    When dealing with a regression problem with multiple features, what challenge does minimizing the risk of overfitting pose in selecting the number of coefficients?

    <p>The more coefficients, the more likely overfitting becomes</p> Signup and view all the answers

    What is the main purpose of denoising autoencoders in simple terms?

    <p>To reconstruct the original input from a corrupted version of it</p> Signup and view all the answers

    In denoising autoencoders, what type of noise is commonly used for corruption?

    <p>Zero-mask noise (setting some input dimensions to zero)</p> Signup and view all the answers

    What is one of the applications of autoencoders mentioned in the text?

    <p>Anomaly detection</p> Signup and view all the answers

    How many features are used in the Autoencoder with sparse encoding mentioned in the text?

    <p>100 features</p> Signup and view all the answers

    What machine learning algorithm uses the coded features from an Autoencoder in the text?

    <p>Xgboost</p> Signup and view all the answers

    Which type of autoencoder is typically employed for reconstructing images from corrupted versions?

    <p>Denoising autoencoder</p> Signup and view all the answers

    What is the primary target output in denoising autoencoders?

    <p>Original data</p> Signup and view all the answers

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