Init

xfund.py

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+# Lint as: python3
+import json
+import logging
+import os
+import numpy as np
+from PIL import Image
+import datasets
+from transformers import AutoTokenizer
+
+
+_URL = "https://github.com/doc-analysis/XFUND/releases/download/v1.0/"
+
+_LANG = ["zh", "de", "es", "fr", "en", "it", "ja", "pt"]
+logger = logging.getLogger(__name__)
+
+
+def normalize_bbox(bbox, size):
+    return [
+        int(1000 * bbox[0] / size[0]),
+        int(1000 * bbox[1] / size[1]),
+        int(1000 * bbox[2] / size[0]),
+        int(1000 * bbox[3] / size[1]),
+    ]
+
+
+def simplify_bbox(bbox):
+    return [
+        min(bbox[0::2]),
+        min(bbox[1::2]),
+        max(bbox[2::2]),
+        max(bbox[3::2]),
+    ]
+
+
+def merge_bbox(bbox_list):
+    x0, y0, x1, y1 = list(zip(*bbox_list))
+    return [min(x0), min(y0), max(x1), max(y1)]
+
+
+def load_image(image_path):
+    image = Image.open(image_path).convert("RGB")
+    w, h = image.size
+    # resize image to 224x224
+    image = image.resize((224, 224))
+    image = np.asarray(image)  
+    image = image[:, :, ::-1] # flip color channels from RGB to BGR
+    image = image.transpose(2, 0, 1) # move channels to first dimension
+    return image, (w, h)
+
+class XFUNDConfig(datasets.BuilderConfig):
+    """BuilderConfig for XFUND."""
+
+    def __init__(self, lang, additional_langs=None, **kwargs):
+        """
+        Args:
+            lang: string, language for the input text
+            **kwargs: keyword arguments forwarded to super.
+        """
+        super(XFUNDConfig, self).__init__(**kwargs)
+        self.lang = lang
+        self.additional_langs = additional_langs
+
+
+class XFUND(datasets.GeneratorBasedBuilder):
+    """XFUND dataset."""
+
+    BUILDER_CONFIGS = [XFUNDConfig(name=f"xfund.{lang}", lang=lang) for lang in _LANG]
+
+    tokenizer = AutoTokenizer.from_pretrained("xlm-roberta-base")
+
+    def _info(self):
+        return datasets.DatasetInfo(
+            features=datasets.Features(
+                {
+                    "id": datasets.Value("string"),
+                    "input_ids": datasets.Sequence(datasets.Value("int64")),
+                    "bbox": datasets.Sequence(datasets.Sequence(datasets.Value("int64"))),
+                    "labels": datasets.Sequence(
+                        datasets.ClassLabel(
+                            names=["O", "B-QUESTION", "B-ANSWER", "B-HEADER", "I-ANSWER", "I-QUESTION", "I-HEADER"]
+                        )
+                    ),
+                    "image": datasets.Array3D(shape=(3, 224, 224), dtype="uint8"),
+                    "entities": datasets.Sequence(
+                        {
+                            "start": datasets.Value("int64"),
+                            "end": datasets.Value("int64"),
+                            "label": datasets.ClassLabel(names=["HEADER", "QUESTION", "ANSWER"]),
+                        }
+                    ),
+                    "relations": datasets.Sequence(
+                        {
+                            "head": datasets.Value("int64"),
+                            "tail": datasets.Value("int64"),
+                            "start_index": datasets.Value("int64"),
+                            "end_index": datasets.Value("int64"),
+                        }
+                    ),
+                }
+            ),
+            supervised_keys=None,
+        )
+
+    def _split_generators(self, dl_manager):
+        """Returns SplitGenerators."""
+        urls_to_download = {
+            "train": [f"{_URL}{self.config.lang}.train.json", f"{_URL}{self.config.lang}.train.zip"],
+            "val": [f"{_URL}{self.config.lang}.val.json", f"{_URL}{self.config.lang}.val.zip"],
+            # "test": [f"{_URL}{self.config.lang}.test.json", f"{_URL}{self.config.lang}.test.zip"],
+        }
+        downloaded_files = dl_manager.download_and_extract(urls_to_download)
+        train_files_for_many_langs = [downloaded_files["train"]]
+        val_files_for_many_langs = [downloaded_files["val"]]
+        # test_files_for_many_langs = [downloaded_files["test"]]
+        if self.config.additional_langs:
+            additional_langs = self.config.additional_langs.split("+")
+            if "all" in additional_langs:
+                additional_langs = [lang for lang in _LANG if lang != self.config.lang]
+            for lang in additional_langs:
+                urls_to_download = {"train": [f"{_URL}{lang}.train.json", f"{_URL}{lang}.train.zip"]}
+                additional_downloaded_files = dl_manager.download_and_extract(urls_to_download)
+                train_files_for_many_langs.append(additional_downloaded_files["train"])
+
+        logger.info(f"Training on {self.config.lang} with additional langs({self.config.additional_langs})")
+        logger.info(f"Evaluating on {self.config.lang}")
+        logger.info(f"Testing on {self.config.lang}")
+        return [
+            datasets.SplitGenerator(name=datasets.Split.TRAIN, gen_kwargs={"filepaths": train_files_for_many_langs}),
+            datasets.SplitGenerator(
+                name=datasets.Split.VALIDATION, gen_kwargs={"filepaths": val_files_for_many_langs}
+            ),
+            # datasets.SplitGenerator(name=datasets.Split.TEST, gen_kwargs={"filepaths": test_files_for_many_langs}),
+        ]
+
+    def _generate_examples(self, filepaths):
+        for filepath in filepaths:
+            logger.info("Generating examples from = %s", filepath)
+            with open(filepath[0], "r") as f:
+                data = json.load(f)
+
+            for doc in data["documents"]:
+                doc["img"]["fpath"] = os.path.join(filepath[1], doc["img"]["fname"])
+                image, size = load_image(doc["img"]["fpath"])
+                document = doc["document"]
+                tokenized_doc = {"input_ids": [], "bbox": [], "labels": []}
+                entities = []
+                relations = []
+                id2label = {}
+                entity_id_to_index_map = {}
+                empty_entity = set()
+                for line in document:
+                    if len(line["text"]) == 0:
+                        empty_entity.add(line["id"])
+                        continue
+                    id2label[line["id"]] = line["label"]
+                    relations.extend([tuple(sorted(l)) for l in line["linking"]])
+                    tokenized_inputs = self.tokenizer(
+                        line["text"],
+                        add_special_tokens=False,
+                        return_offsets_mapping=True,
+                        return_attention_mask=False,
+                    )
+                    text_length = 0
+                    ocr_length = 0
+                    bbox = []
+                    last_box = None
+                    for token_id, offset in zip(tokenized_inputs["input_ids"], tokenized_inputs["offset_mapping"]):
+                        if token_id == 6:
+                            bbox.append(None)
+                            continue
+                        text_length += offset[1] - offset[0]
+                        tmp_box = []
+                        while ocr_length < text_length:
+                            ocr_word = line["words"].pop(0)
+                            ocr_length += len(
+                                self.tokenizer._tokenizer.normalizer.normalize_str(ocr_word["text"].strip())
+                            )
+                            tmp_box.append(simplify_bbox(ocr_word["box"]))
+                        if len(tmp_box) == 0:
+                            tmp_box = last_box
+                        bbox.append(normalize_bbox(merge_bbox(tmp_box), size))
+                        last_box = tmp_box
+                    bbox = [
+                        [bbox[i + 1][0], bbox[i + 1][1], bbox[i + 1][0], bbox[i + 1][1]] if b is None else b
+                        for i, b in enumerate(bbox)
+                    ]
+                    if line["label"] == "other":
+                        label = ["O"] * len(bbox)
+                    else:
+                        label = [f"I-{line['label'].upper()}"] * len(bbox)
+                        label[0] = f"B-{line['label'].upper()}"
+                    tokenized_inputs.update({"bbox": bbox, "labels": label})
+                    if label[0] != "O":
+                        entity_id_to_index_map[line["id"]] = len(entities)
+                        entities.append(
+                            {
+                                "start": len(tokenized_doc["input_ids"]),
+                                "end": len(tokenized_doc["input_ids"]) + len(tokenized_inputs["input_ids"]),
+                                "label": line["label"].upper(),
+                            }
+                        )
+                    for i in tokenized_doc:
+                        tokenized_doc[i] = tokenized_doc[i] + tokenized_inputs[i]
+                relations = list(set(relations))
+                relations = [rel for rel in relations if rel[0] not in empty_entity and rel[1] not in empty_entity]
+                kvrelations = []
+                for rel in relations:
+                    pair = [id2label[rel[0]], id2label[rel[1]]]
+                    if pair == ["question", "answer"]:
+                        kvrelations.append(
+                            {"head": entity_id_to_index_map[rel[0]], "tail": entity_id_to_index_map[rel[1]]}
+                        )
+                    elif pair == ["answer", "question"]:
+                        kvrelations.append(
+                            {"head": entity_id_to_index_map[rel[1]], "tail": entity_id_to_index_map[rel[0]]}
+                        )
+                    else:
+                        continue
+
+                def get_relation_span(rel):
+                    bound = []
+                    for entity_index in [rel["head"], rel["tail"]]:
+                        bound.append(entities[entity_index]["start"])
+                        bound.append(entities[entity_index]["end"])
+                    return min(bound), max(bound)
+
+                relations = sorted(
+                    [
+                        {
+                            "head": rel["head"],
+                            "tail": rel["tail"],
+                            "start_index": get_relation_span(rel)[0],
+                            "end_index": get_relation_span(rel)[1],
+                        }
+                        for rel in kvrelations
+                    ],
+                    key=lambda x: x["head"],
+                )
+                chunk_size = 512
+                for chunk_id, index in enumerate(range(0, len(tokenized_doc["input_ids"]), chunk_size)):
+                    item = {}
+                    for k in tokenized_doc:
+                        item[k] = tokenized_doc[k][index : index + chunk_size]
+                    entities_in_this_span = []
+                    global_to_local_map = {}
+                    for entity_id, entity in enumerate(entities):
+                        if (
+                            index <= entity["start"] < index + chunk_size
+                            and index <= entity["end"] < index + chunk_size
+                        ):
+                            entity["start"] = entity["start"] - index
+                            entity["end"] = entity["end"] - index
+                            global_to_local_map[entity_id] = len(entities_in_this_span)
+                            entities_in_this_span.append(entity)
+                    relations_in_this_span = []
+                    for relation in relations:
+                        if (
+                            index <= relation["start_index"] < index + chunk_size
+                            and index <= relation["end_index"] < index + chunk_size
+                        ):
+                            relations_in_this_span.append(
+                                {
+                                    "head": global_to_local_map[relation["head"]],
+                                    "tail": global_to_local_map[relation["tail"]],
+                                    "start_index": relation["start_index"] - index,
+                                    "end_index": relation["end_index"] - index,
+                                }
+                            )
+                    item.update(
+                        {
+                            "id": f"{doc['id']}_{chunk_id}",
+                            "image": image,
+                            "entities": entities_in_this_span,
+                            "relations": relations_in_this_span,
+                        }
+                    )
+                    yield f"{doc['id']}_{chunk_id}", item