Machine Learning Engineer Data Manipulation (SQL/Python) Interview Questions
Practice the exact questions companies are asking right now.
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Debug ML pipeline and build text parser
- Given raw text files with noisy formatting, implement a robust parser that outputs structured examples; handle delimiters, quoting/escaping, encodin...
Train and analyze a classifier
Given a labeled dataset for binary classification, implement an end-to-end Python solution to train and analyze a classifier. Tasks: ( 1) perform EDA ...
Implement vectorized NumPy ops and explain broadcasting
Implement vectorized NumPy code for: (a) computing pairwise cosine similarity between two real-valued matrices X (shape n×d) and Y (shape m×d) without...
Transform flat keys into nested dictionary
You are given a flat collection of parameter keys like ['layer1.attention.q_proj.weight', 'layer1.attention.k_proj.weight', 'layer1.mlp.fc1.weight', ....
Implement a robust Python generator
Given a list of integers, write a Python generator that yields the integers from the list while handling edge cases such as None values, empty input, ...
Implement simulation-based portfolio optimizer in Python
Given a pandas DataFrame 'returns' of daily asset returns (index: dates; columns: tickers) and an annualized risk‑free rate r_f, implement a simulatio...
Load and prepare JSON for modeling
Using Python in a Jupyter notebook, load a JSON dataset with fields: ( 1) hours spent reading A posts (float), ( 2) hours spent reading B posts (float...
Implement and vectorize NumPy Conv2D
Implement a 2D convolution operation from scratch using NumPy only (no TensorFlow or PyTorch). Assume NCHW input shape (N, C_in, H_in, W_in) and weigh...
Compute nearest index within threshold after walking distances
You are given: ( 1) points: a list of N 2D coordinates in miles, points[i] = [x_i, y_i], ordered; ( 2) distances: a list of M nonnegative floats (mile...
Process CSV for portfolio returns and metrics
Given one or more CSV files containing daily asset prices or returns and optional portfolio weights, write Python (pandas) code to: a) load, clean, an...