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Version: 3.2

MiniCPM OCR

haystack_integrations.components.converters.minicpm_ocr.converter​

MiniCPMOCRDocumentConverter​

Converts PDF and image files to Documents using self-hosted MiniCPM-OCR.

The component runs the official minicpm-ocr SDK locally: it detects the layout of every page with PP-DocLayout, crops each block, sends it to a MiniCPM-OCR inference server, and assembles the recognized blocks into Markdown. The inference server can run on vLLM, SGLang, llama.cpp or Ollama; only the layout model runs in this process.

Returns one Document per source, with pages separated by form feed characters (\f), so DocumentSplitter can split the content by page.

Usage example​

python
from haystack_integrations.components.converters.minicpm_ocr import MiniCPMOCRDocumentConverter

converter = MiniCPMOCRDocumentConverter(server_url="http://localhost:8000", model="minicpm-ocr")
converter.warm_up()
result = converter.run(sources=["sample.pdf"])
documents = result["documents"]

init​

python
__init__(
    *,
    server_url: str,
    model: str = "minicpm-ocr",
    backend: Backend = "vllm",
    api_key: Secret = Secret.from_env_var("MINICPM_OCR_API_KEY", strict=False),
    layout_model_dir: str | None = None,
    layout_device: str = "cpu",
    request_timeout: float = 300.0,
    page_workers: int = 1,
    max_workers: int = 1,
    store_full_path: bool = False
) -> None

Create a MiniCPM-OCR document converter.

Parameters:

  • server_url (str) – Base URL of the MiniCPM-OCR inference server, for example http://localhost:8000 for vLLM or http://localhost:11434 for Ollama. A trailing /v1 is accepted and removed, because the SDK appends /v1/chat/completions itself.
  • model (str) – Model name served by the inference server.
  • backend (Backend) – Server dialect: vllm, llamacpp, ollama or openai (SGLang and LMDeploy use openai).
  • api_key (Secret) – Optional API key for the inference server.
  • layout_model_dir (str | None) – Directory holding the PP-DocLayout model. When unset, the SDK uses ~/.cache/minicpm-ocr/layout. The model is downloaded there in warm_up() if it is missing.
  • layout_device (str) – Device for layout detection, for example cpu or cuda:0.
  • request_timeout (float) – Timeout in seconds for one recognition request.
  • page_workers (int) – Pages rendered and detected concurrently.
  • max_workers (int) – Recognition requests in flight concurrently.
  • store_full_path (bool) – If True, the full path of the source file is stored in the Document metadata. If False, only the file name is stored.

Raises:

  • ValueError – If server_url is empty, backend is unknown, or a worker count is not positive.

warm_up​

python
warm_up() -> None

Make sure the PP-DocLayout layout model is available locally, downloading it on first use.

run​

python
run(
    sources: list[str | Path | ByteStream],
    meta: dict[str, Any] | list[dict[str, Any]] | None = None,
) -> dict[str, list[Document]]

Convert PDF or image files to Documents.

Parameters:

  • sources (list[str | Path | ByteStream]) – List of file paths or ByteStream objects. Supported formats are PDF, PNG, JPEG, BMP, TIFF and WebP.
  • meta (dict[str, Any] | list[dict[str, Any]] | None) – Optional metadata to attach to the Documents. A single dict is applied to all documents; a list must match the number of sources.

Returns:

  • dict[str, list[Document]] – A dictionary with the following key:
  • documents: One Document per converted source. The content is Markdown with pages separated by \f, and the metadata includes page_count and ocr_engine.