From bfae6ba4377ea51a7cc024c5e9772ed069feedf4 Mon Sep 17 00:00:00 2001
From: Jon Bratseth <bratseth@gmail.com>
Date: Mon, 13 Sep 2021 19:29:36 +0200
Subject: Pure Java sentencepiece implementation

---
 .../language/sentencepiece/SentencePieceTest.java  | 78 ++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 linguistics/src/test/java/com/yahoo/language/sentencepiece/SentencePieceTest.java

(limited to 'linguistics/src/test/java/com/yahoo')

diff --git a/linguistics/src/test/java/com/yahoo/language/sentencepiece/SentencePieceTest.java b/linguistics/src/test/java/com/yahoo/language/sentencepiece/SentencePieceTest.java
new file mode 100644
index 00000000000..70361f55750
--- /dev/null
+++ b/linguistics/src/test/java/com/yahoo/language/sentencepiece/SentencePieceTest.java
@@ -0,0 +1,78 @@
+// 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.language.Language;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Path;
+
+import static org.junit.Assert.assertArrayEquals;
+
+/**
+ * @author bratseth
+ */
+public class SentencePieceTest {
+
+    @Test
+    public void testEnglishTokenization() throws IOException {
+        var tester = new SentencePieceTester(new File("src/test/models/sentencepiece/en.wiki.bpe.vs10000.model").toPath());
+        tester.assertSegmented("h", "▁h");
+        tester.assertSegmented("he", "▁he");
+        tester.assertSegmented("hel", "▁hel");
+        tester.assertSegmented("hello", "▁hel", "lo");
+        tester.assertSegmented("hei", "▁he", "i");
+        tester.assertSegmented("hei you", "▁he", "i", "▁you");
+        tester.assertSegmented("hei  you", "▁he", "i", "▁you");
+        tester.assertSegmented("this is another sentence", "▁this", "▁is", "▁another", "▁sentence");
+        tester.assertSegmented("hello world!", "▁hel", "lo", "▁world", "!");
+        tester.assertSegmented("Hello, world!", "▁", "H", "ello", ",", "▁world", "!");
+        tester.assertSegmented("HELLO, world!", "▁", "HELLO", ",", "▁world", "!");
+        tester.assertSegmented("KHJKJHHKJHHSH", "▁", "KHJKJHHKJHHSH");
+        tester.assertSegmented("KHJKJHHKJHHSH hello", "▁", "KHJKJHHKJHHSH", "▁hel", "lo");
+        tester.assertSegmented("  hello  ", "▁hel", "lo");
+        tester.assertSegmented(")(/&#()/\"\")", "▁)", "(", "/", "&", "#", "(", ")", "/", "\"", "\")");
+        tester.assertSegmented(")(/&#(small)/\"in quotes\")", "▁)", "(", "/", "&", "#", "(", "sm", "all", ")", "/", "\"", "in", "▁qu", "otes", "\")");
+        tester.assertSegmented("x.400AS", "▁x", ".", "4", "00", "AS");
+        tester.assertSegmented("A normal sentence. Yes one more.", "▁", "A", "▁normal", "▁sentence", ".", "▁", "Y", "es", "▁one", "▁more", ".");
+        tester.assertEncoded("hello, world!", 908, 1418, 9934, 501, 9960);
+        tester.assertEncoded("Hello, world!", 9912, 0, 6595, 9934, 501, 9960);
+    }
+
+    @Test
+    public void testJapaneseTokenization() throws IOException {
+        SentencePieceEncoder.Builder builder = new SentencePieceEncoder.Builder();
+        builder.addModel(Language.JAPANESE, new File("src/test/models/sentencepiece/ja.wiki.bpe.vs5000.model").toPath());
+        builder.addModel(Language.ENGLISH, new File("src/test/models/sentencepiece/en.wiki.bpe.vs10000.model").toPath());
+        var tester = new SentencePieceTester(builder);
+        tester.assertSegmented(Language.JAPANESE, "いくつかの通常のテキスト", "▁", "いく", "つか", "の", "通常", "の", "テ", "キ", "スト");
+    }
+
+    private static class SentencePieceTester {
+
+        private final SentencePieceEncoder encoder;
+
+        public SentencePieceTester(Path model) {
+            this(new SentencePieceEncoder.Builder().addDefaultModel(model));
+        }
+
+        public SentencePieceTester(SentencePieceEncoder.Builder builder) {
+            encoder = builder.build();
+        }
+
+        private void assertEncoded(String input, Integer ... expectedCodes) {
+            assertArrayEquals(expectedCodes, encoder.encode(input, Language.UNKNOWN).toArray());
+        }
+
+        private void assertSegmented(String input, String ... expectedSegments) {
+            assertSegmented(Language.UNKNOWN, input, expectedSegments);
+        }
+        private void assertSegmented(Language language, String input, String ... expectedSegments) {
+            assertArrayEquals(expectedSegments, encoder.segment(input, language).toArray());
+        }
+
+    }
+
+}
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