Feature/ocr (#13)

OCR dataset processing code added

Author: AvindaShamal

avinda_shamal/src/preprocessing/dataset.py

@@ -0,0 +1,102 @@
+import json
+from PIL import Image as PILImage
+from datasets import (
+    Image,
+    Dataset,
+    Features,
+    Value,
+    Sequence,
+    Array2D,
+    DatasetInfo,
+    SplitDict,
+    Split,
+    DatasetDict,
+    load_from_disk,
+)
+
+dataset_info = DatasetInfo(
+    description="This dataset contains OCR data for text detection and recognition tasks. "
+    "Each image has annotated bounding boxes, labels, and corresponding text.",
+    citation="",
+    license="MIT License",
+    homepage="https://github.com/fcodelabs/intern-ml",
+    features=Features(
+        {
+            "image": Image(),
+            "height": Value("int32"),
+            "width": Value("int32"),
+            "annotations": Sequence(
+                {
+                    "box": Array2D(dtype="float32", shape=(4, 2)),
+                    "text": Value("string"),
+                    "label": Value("int32"),
+                }
+            ),
+        }
+    ),
+    dataset_name="WildReceipt",
+    splits=SplitDict(
+        {
+            "train": Split(name="train"),
+            "test": Split("test"),
+        }
+    ),
+)
+
+
+def walk_through_json(file_name):
+    # load the json file
+    with open(file_name, "r") as fi:
+        file = json.load(fi)
+
+    # parse and reformat the data
+    data = []
+    for item in file:
+        try:
+            annotations = []
+            for annotation in item["annotations"]:
+                annotations.append(
+                    {
+                        "box": [
+                            [annotation["box"][0], annotation["box"][1]],
+                            [annotation["box"][2], annotation["box"][3]],
+                            [annotation["box"][4], annotation["box"][5]],
+                            [annotation["box"][6], annotation["box"][7]],
+                        ],
+                        "text": annotation["text"],
+                        "label": annotation["label"],
+                    }
+                )
+            data.append(
+                {
+                    "image": PILImage.open(item["file_name"]).convert("RGB"),
+                    "height": item["height"],
+                    "width": item["width"],
+                    "annotations": annotations,
+                }
+            )
+        except Exception as e:
+            print(f"Error processing item {item['file_name']}: {e}")
+    return data
+
+
+train_data = walk_through_json("train.json")
+test_data = walk_through_json("test.json")
+train_dataset = Dataset.from_list(train_data, features=dataset_info.features)
+test_dataset = Dataset.from_list(test_data, features=dataset_info.features)
+dataset = DatasetDict(
+    {
+        "train": train_dataset,
+        "test": test_dataset,
+    }
+)
+dataset.info = dataset_info
+
+# save the dataset locally
+dataset.save_to_disk("ocr_dataset")
+print("Dataset Created Successfully")
+
+# push to the hub
+loaded_dataset = load_from_disk("ocr_dataset")
+loaded_dataset.push_to_hub(repo_id="fcodelabs/WildReceipt-OCR")
+print(loaded_dataset)