start python gradio.py failed, the error is: ModuleNotFoundError: No module named 'langchain.docstore'

my pip list
Package Version

accelerate 1.11.0
aiofiles 24.1.0
aistudio-sdk 0.3.8
annotated-types 0.7.0
anyio 4.11.0
attrdict 2.0.1
babel 2.17.0
bce-python-sdk 0.9.46
beautifulsoup4 4.14.2
blinker 1.9.0
Brotli 1.1.0
cachetools 6.2.1
certifi 2025.10.5
cffi 2.0.0
chardet 5.2.0
charset-normalizer 3.4.4
click 8.3.0
colorama 0.4.6
colorlog 6.10.1
contourpy 1.3.3
cryptography 46.0.3
cssselect 1.3.0
cssutils 2.11.1
cycler 0.12.1
Cython 3.1.5
defusedxml 0.7.1
distro 1.9.0
easyocr 1.7.2
einops 0.8.1
et_xmlfile 2.0.0
fastapi 0.119.1
ffmpy 0.6.3
filelock 3.20.0
fire 0.7.1
Flask 3.1.2
flask-babel 4.0.0
fonttools 4.60.1
fsspec 2025.9.0
future 1.0.0
gradio 5.49.1
gradio_client 1.13.3
groovy 0.1.2
h11 0.16.0
httpcore 1.0.9
httpx 0.28.1
huggingface-hub 0.35.3
idna 3.11
imageio 2.37.0
imagesize 1.4.1
imgaug 0.4.0
itsdangerous 2.2.0
Jinja2 3.1.6
jiter 0.11.1
kiwisolver 1.4.9
lazy_loader 0.4
lmdb 1.7.5
lxml 6.0.2
markdown-it-py 4.0.0
MarkupSafe 3.0.3
matplotlib 3.10.7
mdurl 0.1.2
modelscope 1.31.0
more-itertools 10.8.0
mpmath 1.3.0
networkx 3.5
ninja 1.13.0
numpy 1.26.4
openai 2.6.0
opencv-contrib-python 4.6.0.66
opencv-python 4.6.0.66
opencv-python-headless 4.6.0.66
openpyxl 3.1.5
opt-einsum 3.3.0
orjson 3.11.3
packaging 25.0
paddleocr 2.7.3
paddlepaddle 3.2.0
paddlex 3.3.4
pandas 2.3.3
pdf2docx 0.5.8
pillow 11.3.0
pip 25.2
polars 1.34.0
polars-runtime-32 1.34.0
premailer 3.10.0
prettytable 3.16.0
protobuf 6.33.0
psutil 7.1.1
py-cpuinfo 9.0.0
pyclipper 1.3.0.post6
pycparser 2.23
pycryptodome 3.23.0
pydantic 2.11.10
pydantic_core 2.33.2
pydub 0.25.1
Pygments 2.19.2
PyMuPDF 1.26.5
pyOpenSSL 25.3.0
pyparsing 3.2.5
pypdfium2 4.30.0
python-bidi 0.6.6
python-dateutil 2.9.0.post0
python-docx 1.2.0
python-multipart 0.0.20
pytz 2025.2
PyYAML 6.0.2
RapidFuzz 3.14.1
rarfile 4.2
regex 2025.10.22
requests 2.32.5
rich 14.2.0
ruamel.yaml 0.18.15
ruamel.yaml.clib 0.2.14
ruff 0.14.1
safehttpx 0.1.6
safetensors 0.6.2
scikit-image 0.25.2
scipy 1.16.2
semantic-version 2.10.0
sentencepiece 0.2.1
setuptools 80.9.0
shapely 2.1.2
shellingham 1.5.4
six 1.17.0
sniffio 1.3.1
soupsieve 2.8
starlette 0.48.0
supervision 0.26.1
sympy 1.14.0
termcolor 3.1.0
tifffile 2025.10.16
timm 1.0.20
tokenizers 0.21.4
tomlkit 0.13.3
torch 2.9.0
torchvision 0.24.0
tqdm 4.67.1
transformers 4.49.0
typer 0.20.0
typing_extensions 4.15.0
typing-inspection 0.4.2
tzdata 2025.2
ujson 5.11.0
ultralytics 8.3.218
ultralytics-thop 2.0.17
urllib3 2.5.0
uvicorn 0.38.0
visualdl 2.5.3
wcwidth 0.2.14
websockets 15.0.1
Werkzeug 3.1.3
wheel 0.45.1

Start by reproducing the reported failure with gradio.py, then inspect the project's dependency and setup files for how the missing langchain.docstore import is expected to be provided. Done means the launch no longer raises ModuleNotFoundError in a documented environment; no test file or specific source entry point is named.