Building a Fixed-Length CAPTCHA OCR Model With Multi-Head Classification

Futurism Tech Brief By HackerNoon · May 12, 2026 · 16m

This story was originally published on HackerNoon at: https://hackernoon.com/building-a-fixed-length-captcha-ocr-model-with-multi-head-classification.

How a multi-head CNN with position embeddings achieved 100% accuracy on fixed-length CAPTCHA OCR without using CRNNs or CTC loss.

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This story was written by: @genesys. Learn more…