Add background removal pipeline

README.md

@@ -235,6 +235,7 @@ You can refine your search by selecting the task you're interested in (e.g., [te
 
 | Task                     | ID | Description | Supported? |
 |--------------------------|----|-------------|------------|
+| [Background Removal](https://huggingface.co/tasks/image-segmentation#background-removal)       | `background-removal`   | Isolating the main subject of an image by removing or making the background transparent. | ✅ [(docs)](https://huggingface.co/docs/transformers.js/api/pipelines#module_pipelines.BackgroundRemovalPipeline)<br>[(models)](https://huggingface.co/models?other=background-removal&library=transformers.js) |
 | [Depth Estimation](https://huggingface.co/tasks/depth-estimation)         |  `depth-estimation`  | Predicting the depth of objects present in an image. | ✅ [(docs)](https://huggingface.co/docs/transformers.js/api/pipelines#module_pipelines.DepthEstimationPipeline)<br>[(models)](https://huggingface.co/models?pipeline_tag=depth-estimation&library=transformers.js) |
 | [Image Classification](https://huggingface.co/tasks/image-classification)                | `image-classification`   | Assigning a label or class to an entire image. | ✅ [(docs)](https://huggingface.co/docs/transformers.js/api/pipelines#module_pipelines.ImageClassificationPipeline)<br>[(models)](https://huggingface.co/models?pipeline_tag=image-classification&library=transformers.js) |
 | [Image Segmentation](https://huggingface.co/tasks/image-segmentation)       | `image-segmentation`   | Divides an image into segments where each pixel is mapped to an object. This task has multiple variants such as instance segmentation, panoptic segmentation and semantic segmentation. | ✅ [(docs)](https://huggingface.co/docs/transformers.js/api/pipelines#module_pipelines.ImageSegmentationPipeline)<br>[(models)](https://huggingface.co/models?pipeline_tag=image-segmentation&library=transformers.js) |

docs/snippets/5_supported-tasks.snippet

@@ -22,6 +22,7 @@
 
 | Task                     | ID | Description | Supported? |
 |--------------------------|----|-------------|------------|
+| [Background Removal](https://huggingface.co/tasks/image-segmentation#background-removal)       | `background-removal`   | Isolating the main subject of an image by removing or making the background transparent. | ✅ [(docs)](https://huggingface.co/docs/transformers.js/api/pipelines#module_pipelines.BackgroundRemovalPipeline)<br>[(models)](https://huggingface.co/models?other=background-removal&library=transformers.js) |
 | [Depth Estimation](https://huggingface.co/tasks/depth-estimation)         |  `depth-estimation`  | Predicting the depth of objects present in an image. | ✅ [(docs)](https://huggingface.co/docs/transformers.js/api/pipelines#module_pipelines.DepthEstimationPipeline)<br>[(models)](https://huggingface.co/models?pipeline_tag=depth-estimation&library=transformers.js) |
 | [Image Classification](https://huggingface.co/tasks/image-classification)                | `image-classification`   | Assigning a label or class to an entire image. | ✅ [(docs)](https://huggingface.co/docs/transformers.js/api/pipelines#module_pipelines.ImageClassificationPipeline)<br>[(models)](https://huggingface.co/models?pipeline_tag=image-classification&library=transformers.js) |
 | [Image Segmentation](https://huggingface.co/tasks/image-segmentation)       | `image-segmentation`   | Divides an image into segments where each pixel is mapped to an object. This task has multiple variants such as instance segmentation, panoptic segmentation and semantic segmentation. | ✅ [(docs)](https://huggingface.co/docs/transformers.js/api/pipelines#module_pipelines.ImageSegmentationPipeline)<br>[(models)](https://huggingface.co/models?pipeline_tag=image-segmentation&library=transformers.js) |

src/models.js

@@ -5223,6 +5223,7 @@ export class SwinForImageClassification extends SwinPreTrainedModel {
         return new SequenceClassifierOutput(await super._call(model_inputs));
     }
 }
+export class SwinForSemanticSegmentation extends SwinPreTrainedModel { }
 //////////////////////////////////////////////////
 
 //////////////////////////////////////////////////
@@ -6825,6 +6826,8 @@ export class MobileNetV1ForImageClassification extends MobileNetV1PreTrainedMode
         return new SequenceClassifierOutput(await super._call(model_inputs));
     }
 }
+
+export class MobileNetV1ForSemanticSegmentation extends MobileNetV1PreTrainedModel { }
 //////////////////////////////////////////////////
 
 //////////////////////////////////////////////////
@@ -6848,6 +6851,7 @@ export class MobileNetV2ForImageClassification extends MobileNetV2PreTrainedMode
         return new SequenceClassifierOutput(await super._call(model_inputs));
     }
 }
+export class MobileNetV2ForSemanticSegmentation extends MobileNetV2PreTrainedModel { }
 //////////////////////////////////////////////////
 
 //////////////////////////////////////////////////
@@ -6871,6 +6875,7 @@ export class MobileNetV3ForImageClassification extends MobileNetV3PreTrainedMode
         return new SequenceClassifierOutput(await super._call(model_inputs));
     }
 }
+export class MobileNetV3ForSemanticSegmentation extends MobileNetV3PreTrainedModel { }
 //////////////////////////////////////////////////
 
 //////////////////////////////////////////////////
@@ -6894,6 +6899,7 @@ export class MobileNetV4ForImageClassification extends MobileNetV4PreTrainedMode
         return new SequenceClassifierOutput(await super._call(model_inputs));
     }
 }
+export class MobileNetV4ForSemanticSegmentation extends MobileNetV4PreTrainedModel { }
 //////////////////////////////////////////////////
 
 //////////////////////////////////////////////////
@@ -7158,20 +7164,29 @@ export class PretrainedMixin {
         if (!this.MODEL_CLASS_MAPPINGS) {
             throw new Error("`MODEL_CLASS_MAPPINGS` not implemented for this type of `AutoClass`: " + this.name);
         }
-
+        const model_type = options.config.model_type;
         for (const MODEL_CLASS_MAPPING of this.MODEL_CLASS_MAPPINGS) {
-            const modelInfo = MODEL_CLASS_MAPPING.get(options.config.model_type);
+            let modelInfo = MODEL_CLASS_MAPPING.get(model_type);
             if (!modelInfo) {
-                continue; // Item not found in this mapping
+                // As a fallback, we check if model_type is specified as the exact class
+                for (const cls of MODEL_CLASS_MAPPING.values()) {
+                    if (cls[0] === model_type) {
+                        modelInfo = cls;
+                        break;
+                    }
+                }
+                if (!modelInfo) continue; // Item not found in this mapping
             }
             return await modelInfo[1].from_pretrained(pretrained_model_name_or_path, options);
         }
 
         if (this.BASE_IF_FAIL) {
-            console.warn(`Unknown model class "${options.config.model_type}", attempting to construct from base class.`);
+            if (!(CUSTOM_ARCHITECTURES.has(model_type))) {
+                console.warn(`Unknown model class "${model_type}", attempting to construct from base class.`);
+            }
             return await PreTrainedModel.from_pretrained(pretrained_model_name_or_path, options);
         } else {
-            throw Error(`Unsupported model type: ${options.config.model_type}`)
+            throw Error(`Unsupported model type: ${model_type}`)
         }
     }
 }
@@ -7524,6 +7539,12 @@ const MODEL_FOR_IMAGE_SEGMENTATION_MAPPING_NAMES = new Map([
 const MODEL_FOR_SEMANTIC_SEGMENTATION_MAPPING_NAMES = new Map([
     ['segformer', ['SegformerForSemanticSegmentation', SegformerForSemanticSegmentation]],
     ['sapiens', ['SapiensForSemanticSegmentation', SapiensForSemanticSegmentation]],
+
+    ['swin', ['SwinForSemanticSegmentation', SwinForSemanticSegmentation]],
+    ['mobilenet_v1', ['MobileNetV1ForSemanticSegmentation', MobileNetV1ForSemanticSegmentation]],
+    ['mobilenet_v2', ['MobileNetV2ForSemanticSegmentation', MobileNetV2ForSemanticSegmentation]],
+    ['mobilenet_v3', ['MobileNetV3ForSemanticSegmentation', MobileNetV3ForSemanticSegmentation]],
+    ['mobilenet_v4', ['MobileNetV4ForSemanticSegmentation', MobileNetV4ForSemanticSegmentation]],
 ]);
 
 const MODEL_FOR_UNIVERSAL_SEGMENTATION_MAPPING_NAMES = new Map([
@@ -7668,6 +7689,19 @@ for (const [name, model, type] of CUSTOM_MAPPING) {
     MODEL_NAME_TO_CLASS_MAPPING.set(name, model);
 }
 
+const CUSTOM_ARCHITECTURES = new Map([
+    ['modnet', MODEL_FOR_IMAGE_SEGMENTATION_MAPPING_NAMES],
+    ['birefnet', MODEL_FOR_IMAGE_SEGMENTATION_MAPPING_NAMES],
+    ['isnet', MODEL_FOR_IMAGE_SEGMENTATION_MAPPING_NAMES],
+    ['ben', MODEL_FOR_IMAGE_SEGMENTATION_MAPPING_NAMES],
+]);
+for (const [name, mapping] of CUSTOM_ARCHITECTURES.entries()) {
+    mapping.set(name, ['PreTrainedModel', PreTrainedModel])
+    MODEL_TYPE_MAPPING.set(name, MODEL_TYPES.EncoderOnly);
+    MODEL_CLASS_TO_NAME_MAPPING.set(PreTrainedModel, name);
+    MODEL_NAME_TO_CLASS_MAPPING.set(name, PreTrainedModel);
+}
+
 
 /**
  * Helper class which is used to instantiate pretrained models with the `from_pretrained` function.

src/pipelines.js

@@ -2095,7 +2095,7 @@ export class ImageClassificationPipeline extends (/** @type {new (options: Image
 
 /**
  * @typedef {Object} ImageSegmentationPipelineOutput
- * @property {string} label The label of the segment.
+ * @property {string|null} label The label of the segment.
  * @property {number|null} score The score of the segment.
  * @property {RawImage} mask The mask of the segment.
  * 
@@ -2165,14 +2165,30 @@ export class ImageSegmentationPipeline extends (/** @type {new (options: ImagePi
         const preparedImages = await prepareImages(images);
         const imageSizes = preparedImages.map(x => [x.height, x.width]);
 
-        const { pixel_values, pixel_mask } = await this.processor(preparedImages);
-        const output = await this.model({ pixel_values, pixel_mask });
+        const inputs = await this.processor(preparedImages);
+
+        const { inputNames, outputNames } = this.model.sessions['model'];
+        if (!inputNames.includes('pixel_values')) {
+            if (inputNames.length !== 1) {
+                throw Error(`Expected a single input name, but got ${inputNames.length} inputs: ${inputNames}.`);
+            }
+
+            const newName = inputNames[0];
+            if (newName in inputs) {
+                throw Error(`Input name ${newName} already exists in the inputs.`);
+            }
+            // To ensure compatibility with certain background-removal models,
+            // we may need to perform a mapping of input to output names
+            inputs[newName] = inputs.pixel_values;
+        }
+
+        const output = await this.model(inputs);
 
         let fn = null;
         if (subtask !== null) {
             fn = this.subtasks_mapping[subtask];
-        } else {
-            for (let [task, func] of Object.entries(this.subtasks_mapping)) {
+        } else if (this.processor.image_processor) {
+            for (const [task, func] of Object.entries(this.subtasks_mapping)) {
                 if (func in this.processor.image_processor) {
                     fn = this.processor.image_processor[func].bind(this.processor.image_processor);
                     subtask = task;
@@ -2186,7 +2202,23 @@ export class ImageSegmentationPipeline extends (/** @type {new (options: ImagePi
 
         /** @type {ImageSegmentationPipelineOutput[]} */
         const annotation = [];
-        if (subtask === 'panoptic' || subtask === 'instance') {
+        if (!subtask) {
+            // Perform standard image segmentation
+            const result = output[outputNames[0]];
+            for (let i = 0; i < imageSizes.length; ++i) {
+                const size = imageSizes[i];
+                const item = result[i];
+                if (item.data.some(x => x < 0 || x > 1)) {
+                    item.sigmoid_();
+                }
+                const mask = await RawImage.fromTensor(item.mul_(255).to('uint8')).resize(size[1], size[0]);
+                annotation.push({
+                    label: null,
+                    score: null,
+                    mask
+                });
+            }
+        } else if (subtask === 'panoptic' || subtask === 'instance') {
             const processed = fn(
                 output,
                 threshold,
@@ -2242,6 +2274,63 @@ export class ImageSegmentationPipeline extends (/** @type {new (options: ImagePi
     }
 }
 
+
+/**
+ * @typedef {Object} BackgroundRemovalPipelineOptions Parameters specific to image segmentation pipelines.
+ * 
+ * @callback BackgroundRemovalPipelineCallback Segment the input images.
+ * @param {ImagePipelineInputs} images The input images.
+ * @param {BackgroundRemovalPipelineOptions} [options] The options to use for image segmentation.
+ * @returns {Promise<RawImage[]>} The images with the background removed.
+ * 
+ * @typedef {ImagePipelineConstructorArgs & BackgroundRemovalPipelineCallback & Disposable} BackgroundRemovalPipelineType
+ */
+
+/**
+ * Background removal pipeline using certain `AutoModelForXXXSegmentation`.
+ * This pipeline removes the backgrounds of images.
+ * 
+ * **Example:** Perform background removal with `Xenova/modnet`.
+ * ```javascript
+ * const segmenter = await pipeline('background-removal', 'Xenova/modnet');
+ * const url = 'https://huggingface.co/datasets/Xenova/transformers.js-docs/resolve/main/portrait-of-woman_small.jpg';
+ * const output = await segmenter(url);
+ * // [
+ * //   RawImage { data: Uint8ClampedArray(648000) [ ... ], width: 360, height: 450, channels: 4 }
+ * // ]
+ * ```
+ */
+export class BackgroundRemovalPipeline extends (/** @type {new (options: ImagePipelineConstructorArgs) => ImageSegmentationPipelineType} */ (ImageSegmentationPipeline)) {
+    /**
+     * Create a new BackgroundRemovalPipeline.
+     * @param {ImagePipelineConstructorArgs} options An object used to instantiate the pipeline.
+     */
+    constructor(options) {
+        super(options);
+    }
+
+    /** @type {BackgroundRemovalPipelineCallback} */
+    async _call(images, options = {}) {
+        const isBatched = Array.isArray(images);
+
+        if (isBatched && images.length !== 1) {
+            throw Error("Background removal pipeline currently only supports a batch size of 1.");
+        }
+
+        const preparedImages = await prepareImages(images);
+
+        // @ts-expect-error TS2339
+        const masks = await super._call(images, options);
+        const result = preparedImages.map((img, i) => {
+            const cloned = img.clone();
+            cloned.putAlpha(masks[i].mask);
+            return cloned;
+        });
+
+        return result;
+    }
+}
+
 /**
  * @typedef {Object} ZeroShotImageClassificationOutput
  * @property {string} label The label identified by the model. It is one of the suggested `candidate_label`.
@@ -2554,7 +2643,7 @@ export class ZeroShotObjectDetectionPipeline extends (/** @type {new (options: T
             const output = await this.model({ ...text_inputs, pixel_values });
 
             let result;
-            if('post_process_grounded_object_detection' in this.processor) {
+            if ('post_process_grounded_object_detection' in this.processor) {
                 // @ts-ignore
                 const processed = this.processor.post_process_grounded_object_detection(
                     output,
@@ -3134,6 +3223,16 @@ const SUPPORTED_TASKS = Object.freeze({
         },
         "type": "multimodal",
     },
+    "background-removal": {
+        // no tokenizer
+        "pipeline": BackgroundRemovalPipeline,
+        "model": [AutoModelForImageSegmentation, AutoModelForSemanticSegmentation, AutoModelForUniversalSegmentation],
+        "processor": AutoProcessor,
+        "default": {
+            "model": "Xenova/modnet",
+        },
+        "type": "image",
+    },
 
     "zero-shot-image-classification": {
         "tokenizer": AutoTokenizer,

tests/asset_cache.js

@@ -24,6 +24,7 @@ const TEST_IMAGES = Object.freeze({
   book_cover: BASE_URL + "book-cover.png",
   corgi: BASE_URL + "corgi.jpg",
   man_on_car: BASE_URL + "young-man-standing-and-leaning-on-car.jpg",
+  portrait_of_woman: BASE_URL + "portrait-of-woman_small.jpg",
 });
 
 const TEST_AUDIOS = {

tests/pipelines/test_pipelines_background_removal.js

@@ -0,0 +1,70 @@
+import { pipeline, BackgroundRemovalPipeline, RawImage } from "../../src/transformers.js";
+
+import { MAX_MODEL_LOAD_TIME, MAX_TEST_EXECUTION_TIME, MAX_MODEL_DISPOSE_TIME, DEFAULT_MODEL_OPTIONS } from "../init.js";
+import { load_cached_image } from "../asset_cache.js";
+
+const PIPELINE_ID = "background-removal";
+
+export default () => {
+  describe("Background Removal", () => {
+    describe("Portrait Segmentation", () => {
+      const model_id = "Xenova/modnet";
+      /** @type {BackgroundRemovalPipeline} */
+      let pipe;
+      beforeAll(async () => {
+        pipe = await pipeline(PIPELINE_ID, model_id, DEFAULT_MODEL_OPTIONS);
+      }, MAX_MODEL_LOAD_TIME);
+
+      it("should be an instance of BackgroundRemovalPipeline", () => {
+        expect(pipe).toBeInstanceOf(BackgroundRemovalPipeline);
+      });
+
+      it(
+        "single",
+        async () => {
+          const image = await load_cached_image("portrait_of_woman");
+
+          const output = await pipe(image);
+          expect(output).toHaveLength(1);
+          expect(output[0]).toBeInstanceOf(RawImage);
+          expect(output[0].width).toEqual(image.width);
+          expect(output[0].height).toEqual(image.height);
+          expect(output[0].channels).toEqual(4); // With alpha channel
+        },
+        MAX_TEST_EXECUTION_TIME,
+      );
+
+      afterAll(async () => {
+        await pipe.dispose();
+      }, MAX_MODEL_DISPOSE_TIME);
+    });
+
+    describe("Selfie Segmentation", () => {
+      const model_id = "onnx-community/mediapipe_selfie_segmentation";
+      /** @type {BackgroundRemovalPipeline } */
+      let pipe;
+      beforeAll(async () => {
+        pipe = await pipeline(PIPELINE_ID, model_id, DEFAULT_MODEL_OPTIONS);
+      }, MAX_MODEL_LOAD_TIME);
+
+      it(
+        "single",
+        async () => {
+          const image = await load_cached_image("portrait_of_woman");
+
+          const output = await pipe(image);
+          expect(output).toHaveLength(1);
+          expect(output[0]).toBeInstanceOf(RawImage);
+          expect(output[0].width).toEqual(image.width);
+          expect(output[0].height).toEqual(image.height);
+          expect(output[0].channels).toEqual(4); // With alpha channel
+        },
+        MAX_TEST_EXECUTION_TIME,
+      );
+
+      afterAll(async () => {
+        await pipe.dispose();
+      }, MAX_MODEL_DISPOSE_TIME);
+    });
+  });
+};