Decomposition truncatedsvdoptions gethashcode

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TruncatedSvdOptions.GetHashCode

A hash consistent with the equality, in constant time.

public int GetHashCode()

Returns — a hash over the scalars and the length of Ω.

Example — equal options hash alike.

using Lodestar.Decomposition;

TruncatedSvdOptions left = new() { RandomMatrix = [1.0, 2.0], Seed = 3 };
TruncatedSvdOptions right = new() { RandomMatrix = [1.0, 2.0], Seed = 3 };

bool alike = left.GetHashCode() == right.GetHashCode();  // => True

Remarks — Ω contributes its length, never its values: equal options necessarily agree on the length, and hashing a features × (components + oversampling) block would make the cheap operation the expensive one. Unequal options are allowed to collide. An absent Ω contributes -1 rather than 0, so it does not collide with an empty one.

Applies to — net10.0, netstandard2.0.

See also — TruncatedSvdOptions.Equals, TruncatedSvdOptions.