Add pipeline

pipeline.py

@@ -0,0 +1,36 @@
+from typing import Any, Dict, List
+
+import numpy as np
+from huggingface_hub import from_pretrained_fastai
+from PIL import Image
+
+
+class ImageClassificationPipeline(Pipeline):
+    def __init__(self, model_id: str):
+        self.model = from_pretrained_fastai(model_id)
+
+        # Obtain labels
+        self.id2label = self.model.dls.vocab
+
+        # Return at most the top 5 predicted classes
+        self.top_k = 5
+
+    def __call__(self, inputs: "Image.Image") -> List[Dict[str, Any]]:
+        """
+        Args:
+            inputs (:obj:`PIL.Image`):
+                The raw image representation as PIL.
+                No transformation made whatsoever from the input. Make all necessary transformations here.
+        Return:
+            A :obj:`list`:. The list contains items that are dicts should be liked {"label": "XXX", "score": 0.82}
+                It is preferred if the returned list is in decreasing `score` order
+        """
+        # FastAI expects a np array, not a PIL Image.
+        _, _, preds = self.model.predict(np.array(inputs))
+        preds = preds.tolist()
+
+        labels = [
+            {"label": str(self.id2label[i]), "score": float(preds[i])}
+            for i in range(len(preds))
+        ]
+        return sorted(labels, key=lambda tup: tup["score"], reverse=True)[: self.top_k]