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TfidfVectorizer.Load

Read a fitted vectorizer back.

public static TfidfVectorizer Load(Stream source, ArtifactLoadOptions options = null)
public static TfidfVectorizer Load(string path, ArtifactLoadOptions options = null)

Parameters — source is a readable stream, left open; path is a file to read. options bounds what will be accepted and defaults to ArtifactLoadOptions's own defaults.

Returns — TfidfVectorizer, fitted and ready to Transform.

Exceptions — ArgumentNullException for a null source. InvalidDataException when the content is not a saved vectorizer, or exceeds a bound in options.

Example — the vocabulary comes back in the order it was saved.

using Lodestar.Text.Vectorization;

var original = new TfidfVectorizer();
original.Fit(["the cat eats", "the dog eats"]);

using var buffer = new MemoryStream();
original.Save(buffer);
buffer.Position = 0;

TfidfVectorizer restored = TfidfVectorizer.Load(buffer);
string first = restored.GetFeatureNames()[0];  // => cat

Remarks — options is what stands between a file and an allocation: a saved vectorizer declaring a hundred million vocabulary entries would otherwise be believed. Bounds are refused rather than truncated, so an oversized file is an error rather than a quietly smaller model.

Applies to — net10.0, netstandard2.0.

See also — TfidfVectorizer.Save, ArtifactLoadOptions.