Knowledge graph memory misses instructions on library to install #1161
Description
When trying to assign Knowledge graph memory to a chain while networkx is not installed yet, you'll get the error below. This is not in line with the rest of the langchain codebase, which will catch the error and tell you to
pip install networkx
The documentation on Knowledge graph memory also doesn't refer to networkx.
File "pydantic/main.py", line 340, in pydantic.main.BaseModel.__init__ File "pydantic/main.py", line 1067, in pydantic.main.validate_model File "pydantic/fields.py", line 439, in pydantic.fields.ModelField.get_default File "/Users/<local>/envs/py310/lib/python3.10/site-packages/langchain/graphs/networkx_graph.py", line 53, in __init__ import networkx as nx ModuleNotFoundError: No module named 'networkx' Great to have this memory option!