Which of the following statements about gradient descent and learning rate is true?

Question

BlackTom AI · Accepted Answer

To evaluate the statements, we need to recall how gradient descent and learning rate function in optimization.
Option 1: 'Gradient descent is only used in unsupervised learning algorithms.' This is incorrect because gradient descent is a general optimization method used across many learning paradigms, including supervised learning (e.g., training neural networks with labeled data), unsupervised learning, and reinforcement learning. Limiting it to unsupervised learning misrepresents its applicability.
Option 2: 'The learning rate controls the size of the steps taken during the optimization process.' This is accurate. The learning rate determines how far we move along the negative gradient (the direction of steepest descent) in each iteration. A larger learning rate means bigger steps, while a smaller rate yields finer, more gradual updates.
Option 3: 'A very large learning rate guarantees faster and more accurate convergence.' This is misleading. While a larger learning rate can reduce the number of iterations, it does not guarantee faster or more accurate convergence; in fact, it often causes unstable training or divergence if the steps overshoot the minimum.
Option 4: 'Gradient descent updates model parameters by moving in the direction of increasing loss.' This is incorrect. Gradient descent moves parameters in the direction that minimizes loss, i.e., in the opposite direction of the gradient of the loss function with respect to the parameters.

Which of the following statements about gradient descent and learning rate is true?单项选择题

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Which statement is correct?

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