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Beranda / Subjek Wawancara / Machine Learning
WithoutBook LIVE Mock Interviews Machine Learning Related interview subjects: 14

Interview Questions and Answers

Know the top Machine Learning interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 30 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top Machine Learning interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 1

What is the difference between supervised and unsupervised learning?

Supervised learning involves training a model on a labeled dataset, while unsupervised learning deals with unlabeled data where the algorithm tries to find patterns or relationships on its own.
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Ques 2

What is cross-validation, and why is it important?

Cross-validation is a technique used to assess the performance of a model by dividing the dataset into multiple subsets, training the model on some, and testing on others. It helps to obtain a more reliable estimate of a model's performance.
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Ques 3

What is overfitting, and how can it be prevented?

Overfitting occurs when a model learns the training data too well, capturing noise and producing poor generalization on new data. Regularization techniques, cross-validation, and increasing training data are common methods to prevent overfitting.
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Ques 4

How does a decision tree work?

A decision tree is a tree-like model where each node represents a decision based on a feature, and each branch represents an outcome of that decision. It is used for both classification and regression tasks.
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Ques 5

Explain the difference between batch gradient descent and stochastic gradient descent.

Batch gradient descent updates the model parameters using the entire dataset, while stochastic gradient descent updates the parameters using one randomly selected data point at a time. Mini-batch gradient descent is a compromise, using a small subset of the data for each update.
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Ques 6

Explain the K-nearest neighbors (KNN) algorithm.

KNN is a simple, instance-based learning algorithm used for classification and regression. It classifies a new data point based on the majority class of its k-nearest neighbors in the feature space.
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Ques 7

What is the ROC curve, and what does it represent?

The Receiver Operating Characteristic (ROC) curve is a graphical representation of a binary classification model's performance across different thresholds. It plots the true positive rate against the false positive rate, helping to assess the trade-off between sensitivity and specificity.
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Ques 8

How does the term 'dropout' apply to neural networks?

Dropout is a regularization technique used in neural networks to randomly deactivate some neurons during training. It helps prevent overfitting and encourages the network to learn more robust features.
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Ques 9

What is the difference between precision and recall?

Precision is the ratio of correctly predicted positive observations to the total predicted positives, while recall is the ratio of correctly predicted positive observations to the total actual positives. Precision emphasizes the accuracy of positive predictions, while recall focuses on capturing all positive instances.
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Ques 10

Explain the concept of cross-entropy loss in the context of classification problems.

Cross-entropy loss, or log loss, measures the performance of a classification model whose output is a probability value between 0 and 1. It penalizes models that are confidently wrong and is a common choice for binary and multiclass classification problems.
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Ques 11

What is the difference between precision and F1 score?

Precision is the ratio of true positives to the sum of true positives and false positives, while the F1 score is the harmonic mean of precision and recall. F1 score provides a balance between precision and recall, giving equal weight to both metrics.
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Ques 12

Explain the term 'feature importance' in the context of machine learning models.

Feature importance measures the contribution of each feature to the predictive performance of a model. It helps identify the most influential features in making predictions and is often used for feature selection and model interpretation.
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Ques 13

How does the term 'bias' and 'variance' relate to model error in machine learning?

Bias refers to the error introduced by approximating a real-world problem with a simplified model. Variance is the amount by which the model's prediction would change if it were estimated using a different training dataset. The bias-variance tradeoff aims to balance these two sources of error.
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Ques 14

Explain the concept of ensemble learning.

Ensemble learning combines the predictions of multiple models to improve overall performance. Common ensemble techniques include bagging, boosting, and stacking. The idea is that the combination of diverse models can provide better results than individual models.
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