A bar detector: one neuron, four patterns

The weights are a vertical bar. Try every input: the bar fires +1, the inverted bar -1, other shapes and noise stay at 0, with the sums listed.

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Where the numbers come from

gHashTag/t27 specs/ternary/trits.t27 (t27#8979): every value on the page is its fn bodies, compiled to wasm (logic.js), with 18 tests and 4108 runtime asserts
S. Ma and others, The Era of 1-bit LLMs: All Large Language Models are in 1.58 Bits, 2024: weights of -1, 0 and +1