Add wasm support for yolo-v8 pose detection. (#630)

* Add wasm support for yolo-v8 pose detection.

* Better bbox handling.

* Add the pose model in the wasm example lib.

candle-wasm-examples/yolo/src/bin/m.rs

@@ -1,6 +1,7 @@
 use candle_wasm_example_yolo::coco_classes;
 use candle_wasm_example_yolo::model::Bbox;
 use candle_wasm_example_yolo::worker::Model as M;
+use candle_wasm_example_yolo::worker::ModelPose as P;
 use wasm_bindgen::prelude::*;
 
 #[wasm_bindgen]
@@ -26,18 +27,9 @@ impl Model {
         let bboxes = self.inner.run(image, conf_threshold, iou_threshold)?;
         let mut detections: Vec<(String, Bbox)> = vec![];
 
-        for (class_index, bboxes_for_class) in bboxes.iter().enumerate() {
-            for b in bboxes_for_class.iter() {
-                detections.push((
-                    coco_classes::NAMES[class_index].to_string(),
-                    Bbox {
-                        xmin: b.xmin,
-                        ymin: b.ymin,
-                        xmax: b.xmax,
-                        ymax: b.ymax,
-                        confidence: b.confidence,
-                    },
-                ));
+        for (class_index, bboxes_for_class) in bboxes.into_iter().enumerate() {
+            for b in bboxes_for_class.into_iter() {
+                detections.push((coco_classes::NAMES[class_index].to_string(), b));
             }
         }
         let json = serde_json::to_string(&detections)?;
@@ -45,4 +37,30 @@ impl Model {
     }
 }
 
+#[wasm_bindgen]
+pub struct ModelPose {
+    inner: P,
+}
+
+#[wasm_bindgen]
+impl ModelPose {
+    #[wasm_bindgen(constructor)]
+    pub fn new(data: Vec<u8>, model_size: &str) -> Result<ModelPose, JsError> {
+        let inner = P::load_(&data, model_size)?;
+        Ok(Self { inner })
+    }
+
+    #[wasm_bindgen]
+    pub fn run(
+        &self,
+        image: Vec<u8>,
+        conf_threshold: f32,
+        iou_threshold: f32,
+    ) -> Result<String, JsError> {
+        let bboxes = self.inner.run(image, conf_threshold, iou_threshold)?;
+        let json = serde_json::to_string(&bboxes)?;
+        Ok(json)
+    }
+}
+
 fn main() {}