core: Add `TypeError` handler into `get_graph` of `Runnable`

Open hmasdev opened this issue 2 years ago • 2 comments

Description

Problem

Runnable.get_graph fails when InputType or OutputType property raises TypeError.

https://github.com/langchain-ai/langchain/tree/003c98e5b440a420d8dbd5f9fdea08888a4a5a33/libs/core/langchain_core/runnables/base.py#L250-L274
https://github.com/langchain-ai/langchain/tree/003c98e5b440a420d8dbd5f9fdea08888a4a5a33/libs/core/langchain_core/runnables/base.py#L394-L396

This problem prevents getting a graph of Runnable objects whose InputType or OutputType property raises TypeError but whose invoke works well, such as langchain.output_parsers.RegexParser, which I have already pointed out in #19792 that a TypeError would occur.