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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.language.sentencepiece;
import com.yahoo.io.IOUtils;
import com.yahoo.language.Language;
import sentencepiece.SentencepieceModel;
import java.io.IOException;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;
/**
* A SentencePiece model
*
* @author bratseth
*/
final class Model {
final Path source;
final Language language;
final float minScore;
final float maxScore;
final Trie tokens = new Trie();
final Map<Integer, Token> tokenId2Token = new HashMap<>();
Model(Language language, Path path) {
try {
this.source = path;
this.language = language;
var sp = SentencepieceModel.ModelProto.parseFrom(IOUtils.readFileBytes(path.toFile()));
float minScore = Float.MAX_VALUE;
float maxScore = Float.MIN_VALUE;
for (int i = 0; i < sp.getPiecesCount(); i++) {
var piece = sp.getPieces(i);
var type = toTokenType(piece.getType());
var word = piece.getPiece();
tokens.add(type, i, word, piece.getScore());
tokenId2Token.put(i, new Token(word, type));
minScore = Math.min(piece.getScore(), minScore);
maxScore = Math.max(piece.getScore(), maxScore);
}
this.minScore = minScore;
this.maxScore = maxScore;
} catch (IOException e) {
throw new IllegalArgumentException("Could not read a SentencePiece model from " + path, e);
}
}
private static TokenType toTokenType(SentencepieceModel.ModelProto.SentencePiece.Type type) {
switch (type) {
case USER_DEFINED : return TokenType.userDefined;
case UNKNOWN : return TokenType.unknown;
case NORMAL : return TokenType.text;
case CONTROL : return TokenType.control;
case UNUSED : return TokenType.unused;
default : throw new IllegalArgumentException("Unknown token type " + type);
}
}
@Override
public String toString() {
return "SentencePiece model for " + language + ": '" + source + "'";
}
record Token(String text, TokenType type) { }
}
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