mirror of
https://github.com/hwchase17/langchain
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60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
from typing import Iterator, Optional
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from langchain_core.documents import Document
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from langchain_community.document_loaders.base import BaseLoader
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from langchain_community.utilities.wikipedia import WikipediaAPIWrapper
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class WikipediaLoader(BaseLoader):
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"""Load from `Wikipedia`.
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The hard limit on the length of the query is 300 for now.
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Each wiki page represents one Document.
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"""
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def __init__(
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self,
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query: str,
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lang: str = "en",
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load_max_docs: Optional[int] = 25,
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load_all_available_meta: Optional[bool] = False,
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doc_content_chars_max: Optional[int] = 4000,
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):
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"""
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Initializes a new instance of the WikipediaLoader class.
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Args:
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query (str): The query string to search on Wikipedia.
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lang (str, optional): The language code for the Wikipedia language edition.
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Defaults to "en".
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load_max_docs (int, optional): The maximum number of documents to load.
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Defaults to 100.
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load_all_available_meta (bool, optional): Indicates whether to load all
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available metadata for each document. Defaults to False.
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doc_content_chars_max (int, optional): The maximum number of characters
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for the document content. Defaults to 4000.
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"""
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self.query = query
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self.lang = lang
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self.load_max_docs = load_max_docs
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self.load_all_available_meta = load_all_available_meta
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self.doc_content_chars_max = doc_content_chars_max
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def lazy_load(self) -> Iterator[Document]:
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"""
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Loads the query result from Wikipedia into a list of Documents.
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Returns:
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A list of Document objects representing the loaded
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Wikipedia pages.
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"""
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client = WikipediaAPIWrapper(
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lang=self.lang,
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top_k_results=self.load_max_docs,
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load_all_available_meta=self.load_all_available_meta,
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doc_content_chars_max=self.doc_content_chars_max,
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)
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yield from client.load(self.query)
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