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christinakopichristinakopi
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Merge pull request #890 from epfml/tokenization_tests
2 more tokenization tests
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‎discojs/src/processing/text.spec.ts

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import { expect } from "chai";
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import { tokenize } from "./text.js";
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import { AutoTokenizer } from "@xenova/transformers";
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import { Repeat } from "immutable";
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describe("text processing", () => {
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const text = [
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"Hello world, a bc 1 2345, '? 976. Wikipedia is a free content online encyclopedia",
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"written and maintained by a community \n of volunteers, known as Wikipedians.",
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"Founded by Jimmy Wales and Larry Sanger on January 15, 2001, Wikipedia is hosted by the",
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"Wikimedia Foundation, an American nonprofit organization that employs a staff of over 700 people.[7]"
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].join(" ");
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const expectedTokens = [
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15496, 995, 11, 257, 47125, 352, 2242, 2231, 11, 705, 30, 860, 4304, 13,
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15312, 318, 257, 1479, 2695, 2691, 45352, 3194, 290, 9456, 416, 257, 2055,
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220, 198, 286, 11661, 11, 1900, 355, 11145, 46647, 1547, 13, 4062, 276, 416,
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12963, 11769, 290, 13633, 311, 2564, 319, 3269, 1315, 11, 5878, 11, 15312,
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318, 12007, 416, 262, 44877, 5693, 11, 281, 1605, 15346, 4009, 326, 24803,
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257, 3085, 286, 625, 13037, 661, 3693, 22, 60,
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];
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const shortText = 'import { AutoTokenizer } from "@xenova/transformers";'
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// with GPT 2 tokenizer
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const shortExpectedTokens = [
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11748, 1391, 11160, 30642, 7509, 1782, 422,
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44212, 87, 268, 10071, 14, 35636, 364, 8172
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]
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it("can tokenize text with the Llama 3 tokenizer", async () => {
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/llama-3-tokenizer");
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// Tokenizer playgrounds aren't consistent: https://github.com/huggingface/transformers.js/issues/1019
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// Tokenization with python:
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// from transformers import AutoTokenizer
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// tokenizer = AutoTokenizer.from_pretrained("meta-llama/Meta-Llama-3-8B")
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// tokenizer.encode(text, add_special_tokens=False)
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const expectedTokens = [
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9906, 1917, 11, 264, 18399, 220, 16, 220, 11727, 20, 11, 32167,
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220, 25208, 13, 27685, 374, 264, 1949, 2262, 2930, 83708, 5439, 323, 18908,
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555, 264, 4029, 720, 315, 23872, 11, 3967, 439, 119234, 291, 5493, 13, 78811,
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555, 28933, 23782, 323, 30390, 328, 4091, 389, 6186, 220, 868, 11, 220, 1049,
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16, 11, 27685, 374, 21685, 555, 279, 90940, 5114, 11, 459, 3778, 33184, 7471,
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430, 51242, 264, 5687, 315, 927, 220, 7007, 1274, 8032, 22, 60
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]
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const tokens = tokenize(tokenizer, text);
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expect(tokens.toArray()).to.be.deep.equal(expectedTokens);
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});
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it("can tokenize text with the GPT2 tokenizer", async () => {
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/gpt2");
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const tokens = tokenize(tokenizer, text);
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expect(tokens.toArray()).to.be.deep.equal(expectedTokens);
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});
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it("truncates until expected length", async () => {
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/gpt2");
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const tokens = tokenize(tokenizer, text, {truncation: true, max_length: 10});
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expect(tokens.toArray()).to.be.deep.equal(expectedTokens.slice(0, 10));
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});
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it("pads sequence until enough token are generated", async () => {
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/gpt2");
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const max_length = 20
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const tokens = tokenize(tokenizer, shortText, {padding: true, max_length});
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const paddedSequence = Repeat(tokenizer.pad_token_id, max_length - shortExpectedTokens.length)
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.concat(shortExpectedTokens).toArray();
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expect(tokens.toArray()).to.be.deep.equal(paddedSequence);
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});
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it("can pad on right side", async () => {
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/gpt2");
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const max_length = 20
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const tokens = tokenize(tokenizer, shortText, {padding: true, padding_side: 'right', max_length});
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const paddedSequence = shortExpectedTokens.concat(
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Repeat(tokenizer.pad_token_id, max_length - shortExpectedTokens.length).toArray()
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);
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expect(tokens.toArray()).to.be.deep.equal(paddedSequence);
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});
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import { expect } from "chai";
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import { tokenize } from "./text.js";
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import { AutoTokenizer } from "@xenova/transformers";
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import { Repeat } from "immutable";
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import { PreTrainedTokenizer } from "@xenova/transformers";
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interface TokenizerOutput {
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input_ids: number[];
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}
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/**
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* Encodes the text into token IDs and then decodes them back to text
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* Special tokens are skipped during decoding
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*
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* @param tokenizer - An instance of a PreTrainedTokenizer
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* @param text - The text to process
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* @returns The decoded text obtained after encoding and then decoding
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*/
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export function encodeDecode(tokenizer: PreTrainedTokenizer, text: string): string {
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// Encode the text using the tokenizer.
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const encoding = tokenizer(text, { return_tensor: false }) as TokenizerOutput;
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// Decode the token IDs back into text while skipping special tokens.
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return tokenizer.decode(encoding.input_ids, { skip_special_tokens: true });
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}
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describe("text processing", () => {
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const text = [
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"Hello world, a bc 1 2345, '? 976. Wikipedia is a free content online encyclopedia",
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"written and maintained by a community \n of volunteers, known as Wikipedians.",
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"Founded by Jimmy Wales and Larry Sanger on January 15, 2001, Wikipedia is hosted by the",
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"Wikimedia Foundation, an American nonprofit organization that employs a staff of over 700 people.[7]"
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].join(" ");
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const expectedTokens = [
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15496, 995, 11, 257, 47125, 352, 2242, 2231, 11, 705, 30, 860, 4304, 13,
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15312, 318, 257, 1479, 2695, 2691, 45352, 3194, 290, 9456, 416, 257, 2055,
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220, 198, 286, 11661, 11, 1900, 355, 11145, 46647, 1547, 13, 4062, 276, 416,
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12963, 11769, 290, 13633, 311, 2564, 319, 3269, 1315, 11, 5878, 11, 15312,
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318, 12007, 416, 262, 44877, 5693, 11, 281, 1605, 15346, 4009, 326, 24803,
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257, 3085, 286, 625, 13037, 661, 3693, 22, 60,
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];
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const shortText = 'import { AutoTokenizer } from "@xenova/transformers";'
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// with GPT 2 tokenizer
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const shortExpectedTokens = [
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11748, 1391, 11160, 30642, 7509, 1782, 422,
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44212, 87, 268, 10071, 14, 35636, 364, 8172
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]
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it("can tokenize text with the Llama 3 tokenizer", async () => {
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/llama-3-tokenizer");
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// Tokenizer playgrounds aren't consistent: https://github.com/huggingface/transformers.js/issues/1019
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// Tokenization with python:
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// from transformers import AutoTokenizer
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// tokenizer = AutoTokenizer.from_pretrained("meta-llama/Meta-Llama-3-8B")
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// tokenizer.encode(text, add_special_tokens=False)
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const expectedTokens = [
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9906, 1917, 11, 264, 18399, 220, 16, 220, 11727, 20, 11, 32167,
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220, 25208, 13, 27685, 374, 264, 1949, 2262, 2930, 83708, 5439, 323, 18908,
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555, 264, 4029, 720, 315, 23872, 11, 3967, 439, 119234, 291, 5493, 13, 78811,
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555, 28933, 23782, 323, 30390, 328, 4091, 389, 6186, 220, 868, 11, 220, 1049,
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16, 11, 27685, 374, 21685, 555, 279, 90940, 5114, 11, 459, 3778, 33184, 7471,
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430, 51242, 264, 5687, 315, 927, 220, 7007, 1274, 8032, 22, 60
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]
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const tokens = tokenize(tokenizer, text);
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expect(tokens.toArray()).to.be.deep.equal(expectedTokens);
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});
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it("can tokenize text with the GPT2 tokenizer", async () => {
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/gpt2");
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const tokens = tokenize(tokenizer, text);
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expect(tokens.toArray()).to.be.deep.equal(expectedTokens);
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});
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it("truncates until expected length", async () => {
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/gpt2");
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const tokens = tokenize(tokenizer, text, {truncation: true, max_length: 10});
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expect(tokens.toArray()).to.be.deep.equal(expectedTokens.slice(0, 10));
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});
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it("pads sequence until enough token are generated", async () => {
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/gpt2");
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const max_length = 20
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const tokens = tokenize(tokenizer, shortText, {padding: true, max_length});
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const paddedSequence = Repeat(tokenizer.pad_token_id, max_length - shortExpectedTokens.length)
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.concat(shortExpectedTokens).toArray();
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expect(tokens.toArray()).to.be.deep.equal(paddedSequence);
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});
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it("can pad on right side", async () => {
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/gpt2");
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const max_length = 20
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const tokens = tokenize(tokenizer, shortText, {padding: true, padding_side: 'right', max_length});
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const paddedSequence = shortExpectedTokens.concat(
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Repeat(tokenizer.pad_token_id, max_length - shortExpectedTokens.length).toArray()
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);
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expect(tokens.toArray()).to.be.deep.equal(paddedSequence);
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});
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});
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describe("Multi-Tokenizer Tests", function () {
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this.timeout(20000);
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const sampleText = "Hello, world! This is a test string to check tokenization.";
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// List of tokenizer names to test
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const tokenizerNames = [
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"Xenova/gpt2",
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"Xenova/llama-3-tokenizer",
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// "Xenova/bert-base-uncased", // takes too long
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"Xenova/roberta-base",
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"Xenova/distilbert-base-uncased"
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];
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tokenizerNames.forEach((name) => {
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it(`should tokenize text using tokenizer "${name}"`, async () => {
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const tokenizer = await AutoTokenizer.from_pretrained(name);
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const tokens = tokenize(tokenizer, sampleText);
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const tokenArray = tokens.toArray();
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// Checks that we got a non-empty array of tokens and that each token is a number.
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expect(tokenArray).to.be.an("array").that.is.not.empty;
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tokenArray.forEach((token) => {
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expect(token).to.be.a("number");
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});
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});
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});
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});
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describe("Encode-Decode tokenization", function () {
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this.timeout(20000);
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it("should return text close to the original after encode-decode tokenization using GPT2 tokenizer", async function () {
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// Load the GPT2 tokenizer
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const tokenizer = await AutoTokenizer.from_pretrained("Xenova/gpt2");
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const originalText = "Hello, world! This is a test for encode-decode tokenization.";
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// Perform round-trip tokenization
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const decodedText = encodeDecode(tokenizer, originalText);
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// Check that the decoded text is almost equal to the original text
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expect(decodedText).to.equal(originalText);
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});
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});

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