Module binary_encoder 

Binary encoder: encode categorical integers as binary digits.

BinaryEncoder encodes each categorical integer feature into ceil(log2(k)) binary columns, where k is the number of distinct categories. This is more compact than one-hot encoding for high-cardinality features.

Example

Input column with categories {0, 1, 2, 3}:
  0 → [0, 0]
  1 → [0, 1]
  2 → [1, 0]
  3 → [1, 1]

Structs

BinaryEncoder

An unfitted binary encoder.

FittedBinaryEncoder

A fitted binary encoder holding the number of categories and binary digits per input feature.