alleryStart learning →The design matrix X for n training examples with d features (plus intercept) has shape
An × (d + 1)
Bn × n
Cd × d
Dd × n
Answer & Solution
Correct answer: A. n × (d + 1)
X stacks training examples as ROWS
(d+1) columns include the d features plus the x₀ = 1 intercept term.
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