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Add support for PaliGemma (& PaliGemma2) (#1074)
* Bump versions * Add support for PaliGemma (&PaliGemma2) * Add unit tests * Remove debug line * Revert version bump (move to new PR)
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Original file line number | Diff line number | Diff line change |
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import { Processor } from "../../base/processing_utils.js"; | ||
import { AutoImageProcessor } from "../auto/image_processing_auto.js"; | ||
import { AutoTokenizer } from "../../tokenizers.js"; | ||
|
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const IMAGE_TOKEN = "<image>"; | ||
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function build_string_from_input( | ||
prompt, | ||
bos_token, | ||
image_seq_len, | ||
image_token, | ||
num_images, | ||
) { | ||
return `${image_token.repeat(image_seq_len * num_images)}${bos_token}${prompt}\n` | ||
} | ||
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export class PaliGemmaProcessor extends Processor { | ||
static tokenizer_class = AutoTokenizer | ||
static image_processor_class = AutoImageProcessor | ||
static uses_processor_config = false; | ||
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/** | ||
* @typedef {import('../../utils/image.js').RawImage} RawImage | ||
*/ | ||
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// `images` is required, `text` is optional | ||
async _call(/** @type {RawImage|RawImage[]} */ images, text = null, kwargs = {}) { | ||
if (!text) { | ||
console.warn( | ||
"You are using PaliGemma without a text prefix. It will perform as a picture-captioning model." | ||
) | ||
text = "" | ||
} | ||
|
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if (!Array.isArray(images)) { | ||
images = [images] | ||
} | ||
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if (!Array.isArray(text)) { | ||
text = [text] | ||
} | ||
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const bos_token = this.tokenizer.bos_token; | ||
const image_seq_length = this.image_processor.config.image_seq_length; | ||
let input_strings; | ||
if (text.some((t) => t.includes(IMAGE_TOKEN))) { | ||
input_strings = text.map( | ||
sample => { | ||
const expanded_sample = sample.replaceAll(IMAGE_TOKEN, IMAGE_TOKEN.repeat(image_seq_length)); | ||
const bos_rfind_index = expanded_sample.lastIndexOf(IMAGE_TOKEN); | ||
const bos_index = bos_rfind_index === -1 ? 0 : bos_rfind_index + IMAGE_TOKEN.length; | ||
return expanded_sample.slice(0, bos_index) + bos_token + expanded_sample.slice(bos_index) + "\n"; | ||
} | ||
) | ||
} else { | ||
console.warn( | ||
"You are passing both `text` and `images` to `PaliGemmaProcessor`. The processor expects special " + | ||
"image tokens in the text, as many tokens as there are images per each text. It is recommended to " + | ||
"add `<image>` tokens in the very beginning of your text. For this call, we will infer how many images " + | ||
"each text has and add special tokens." | ||
) | ||
|
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input_strings = text.map( | ||
sample => build_string_from_input( | ||
sample, | ||
bos_token, | ||
image_seq_length, | ||
IMAGE_TOKEN, | ||
images.length, | ||
) | ||
) | ||
} | ||
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const text_inputs = this.tokenizer(input_strings, kwargs); | ||
const image_inputs = await this.image_processor(images, kwargs); | ||
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return { | ||
...image_inputs, | ||
...text_inputs, | ||
} | ||
} | ||
} |
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