【功能新增】增强对PPT、DOC知识库文件的OCR识别 (#2013)

* 【功能新增】增强对PPT、DOC文件的OCR识别

* 【功能新增】增强对PPT、DOC文件的OCR识别

* Update mydocloader.py

---------

Co-authored-by: zR <2448370773@qq.com>

document_loaders/__init__.py

@@ -1,2 +1,4 @@
 from .mypdfloader import RapidOCRPDFLoader
-from .myimgloader import RapidOCRLoader
+from .myimgloader import RapidOCRLoader
+from .mydocloader import RapidOCRDocLoader
+from .mypptloader import RapidOCRPPTLoader

document_loaders/mydocloader.py

@@ -0,0 +1,71 @@
+from langchain.document_loaders.unstructured import UnstructuredFileLoader
+from typing import List
+import tqdm
+
+
+class RapidOCRDocLoader(UnstructuredFileLoader):
+    def _get_elements(self) -> List:
+        def doc2text(filepath):
+            from docx.table import _Cell, Table
+            from docx.oxml.table import CT_Tbl
+            from docx.oxml.text.paragraph import CT_P
+            from docx.text.paragraph import Paragraph
+            from docx import Document, ImagePart
+            from PIL import Image
+            from io import BytesIO
+            import numpy as np
+            from rapidocr_onnxruntime import RapidOCR
+            ocr = RapidOCR()
+            doc = Document(filepath)
+            resp = ""
+
+            def iter_block_items(parent):
+                from docx.document import Document
+                if isinstance(parent, Document):
+                    parent_elm = parent.element.body
+                elif isinstance(parent, _Cell):
+                    parent_elm = parent._tc
+                else:
+                    raise ValueError("RapidOCRDocLoader parse fail")
+
+                for child in parent_elm.iterchildren():
+                    if isinstance(child, CT_P):
+                        yield Paragraph(child, parent)
+                    elif isinstance(child, CT_Tbl):
+                        yield Table(child, parent)
+
+            b_unit = tqdm.tqdm(total=len(doc.paragraphs)+len(doc.tables),
+                               desc="RapidOCRDocLoader block index: 0")
+            for i, block in enumerate(iter_block_items(doc)):
+                b_unit.set_description(
+                    "RapidOCRDocLoader  block index: {}".format(i))
+                b_unit.refresh()
+                if isinstance(block, Paragraph):
+                    resp += block.text.strip() + "\n"
+                    images = block._element.xpath('.//pic:pic')  # 获取所有图片
+                    for image in images:
+                        for img_id in image.xpath('.//a:blip/@r:embed'):  # 获取图片id
+                            part = doc.part.related_parts[img_id]  # 根据图片id获取对应的图片
+                            if isinstance(part, ImagePart):
+                                image = Image.open(BytesIO(part._blob))
+                                result, _ = ocr(np.array(image))
+                                if result:
+                                    ocr_result = [line[1] for line in result]
+                                    resp += "\n".join(ocr_result)
+                elif isinstance(block, Table):
+                    for row in block.rows:
+                        for cell in row.cells:
+                            for paragraph in cell.paragraphs:
+                                resp += paragraph.text.strip() + "\n"
+                b_unit.update(1)
+            return resp
+
+        text = doc2text(self.file_path)
+        from unstructured.partition.text import partition_text
+        return partition_text(text=text, **self.unstructured_kwargs)
+
+
+if __name__ == '__main__':
+    loader = RapidOCRDocLoader(file_path="../tests/samples/ocr_test.docx")
+    docs = loader.load()
+    print(docs)

document_loaders/mypptloader.py

@@ -0,0 +1,59 @@
+from langchain.document_loaders.unstructured import UnstructuredFileLoader
+from typing import List
+import tqdm
+
+
+class RapidOCRPPTLoader(UnstructuredFileLoader):
+    def _get_elements(self) -> List:
+        def ppt2text(filepath):
+            from pptx import Presentation
+            from PIL import Image
+            import numpy as np
+            from io import BytesIO
+            from rapidocr_onnxruntime import RapidOCR
+            ocr = RapidOCR()
+            prs = Presentation(filepath)
+            resp = ""
+
+            def extract_text(shape):
+                nonlocal resp
+                if shape.has_text_frame:
+                    resp += shape.text.strip() + "\n"
+                if shape.has_table:
+                    for row in shape.table.rows:
+                        for cell in row.cells:
+                            for paragraph in cell.text_frame.paragraphs:
+                                resp += paragraph.text.strip() + "\n"
+                if shape.shape_type == 13:  # 13 表示图片
+                    image = Image.open(BytesIO(shape.image.blob))
+                    result, _ = ocr(np.array(image))
+                    if result:
+                        ocr_result = [line[1] for line in result]
+                        resp += "\n".join(ocr_result)
+                elif shape.shape_type == 6:  # 6 表示组合
+                    for child_shape in shape.shapes:
+                        extract_text(child_shape)
+
+            b_unit = tqdm.tqdm(total=len(prs.slides),
+                               desc="RapidOCRPPTLoader slide index: 1")
+            # 遍历所有幻灯片
+            for slide_number, slide in enumerate(prs.slides, start=1):
+                b_unit.set_description(
+                    "RapidOCRPPTLoader slide index: {}".format(slide_number))
+                b_unit.refresh()
+                sorted_shapes = sorted(slide.shapes,
+                                       key=lambda x: (x.top, x.left))  # 从上到下、从左到右遍历
+                for shape in sorted_shapes:
+                    extract_text(shape)
+                b_unit.update(1)
+            return resp
+
+        text = ppt2text(self.file_path)
+        from unstructured.partition.text import partition_text
+        return partition_text(text=text, **self.unstructured_kwargs)
+
+
+if __name__ == '__main__':
+    loader = RapidOCRPPTLoader(file_path="../tests/samples/ocr_test.pptx")
+    docs = loader.load()
+    print(docs)

server/knowledge_base/utils.py

@@ -91,9 +91,14 @@ LOADER_DICT = {"UnstructuredHTMLLoader": ['.html'],
                "JSONLoader": [".json"],
                "JSONLinesLoader": [".jsonl"],
                "CSVLoader": [".csv"],
-               # "FilteredCSVLoader": [".csv"], # 需要自己指定，目前还没有支持
+               # "FilteredCSVLoader": [".csv"], 如果使用自定义分割csv
                "RapidOCRPDFLoader": [".pdf"],
+               "RapidOCRDocLoader": ['.docx', '.doc'],
+               "RapidOCRPPTLoader": ['.ppt', '.pptx', ],
                "RapidOCRLoader": ['.png', '.jpg', '.jpeg', '.bmp'],
+               "UnstructuredFileLoader": ['.eml', '.msg', '.rst',
+                                          '.rtf', '.txt', '.xml',
+                                          '.epub', '.odt','.tsv'],
                "UnstructuredEmailLoader": ['.eml', '.msg'],
                "UnstructuredEPubLoader": ['.epub'],
                "UnstructuredExcelLoader": ['.xlsx', '.xls', '.xlsd'],
@@ -109,7 +114,6 @@ LOADER_DICT = {"UnstructuredHTMLLoader": ['.html'],
                "UnstructuredXMLLoader": ['.xml'],
                "UnstructuredPowerPointLoader": ['.ppt', '.pptx'],
                "EverNoteLoader": ['.enex'],
-               "UnstructuredFileLoader": ['.txt'],
                }
 SUPPORTED_EXTS = [ext for sublist in LOADER_DICT.values() for ext in sublist]
 
@@ -141,15 +145,14 @@ def get_LoaderClass(file_extension):
         if file_extension in extensions:
             return LoaderClass
 
-
-# 把一些向量化共用逻辑从KnowledgeFile抽取出来，等langchain支持内存文件的时候，可以将非磁盘文件向量化
 def get_loader(loader_name: str, file_path: str, loader_kwargs: Dict = None):
     '''
     根据loader_name和文件路径或内容返回文档加载器。
     '''
     loader_kwargs = loader_kwargs or {}
     try:
-        if loader_name in ["RapidOCRPDFLoader", "RapidOCRLoader","FilteredCSVLoader"]:
+        if loader_name in ["RapidOCRPDFLoader", "RapidOCRLoader", "FilteredCSVLoader",
+                           "RapidOCRDocLoader", "RapidOCRPPTLoader"]:
             document_loaders_module = importlib.import_module('document_loaders')
         else:
             document_loaders_module = importlib.import_module('langchain.document_loaders')