Serialize the compiled graph to JSON for saving in Redis

[sagorbrur]

Hi,
I want to keep the compiled graph into redis. Is there any way to serialize the compiled graph and save it in Redis?
Please let me know. I am getting error while loading the graph into Redis.
redis.exceptions.DataError: Invalid input of type: 'CompiledStateGraph'. Convert to a bytes, string, int or float first.

Thanks in advance.

Update: I can save the compiled graph as to_json but can't load this. Is there any to load the graph?

Kind regards

[nfcampos]

Hi, what's your use case for storing the compiled graph in redis?

The compiled graph includes references to your node and edge functions therefore can't be serialized to json (or any similar format). You could try pickling the graph, see https://docs.python.org/3/library/pickle.html

[sagorbrur]

Hi @nfcampos ,
Thanks for your reply.
My graph compiling method is a dynamic method where I pass the graph data and compiled the graph accordingly.
For scalling factor, each time a client send the graph data my method will compiled the graph and return it for further use cases.
I tried pickling but there was an error that It couldn't pickle the object due to the below error.

AttributeError: Can't pickle local object 'CompiledStateGraph.attach_node.<locals>._get_state_key'

Kind regards
Sagor

[menon92]

@nfcampos Hi,

I tried https://docs.python.org/3/library/pickle.html but got AttributeError: Can't pickle local object 'CompiledStateGraph.attach_node.<locals>._get_state_key'

I also tried dill but I'm getting,

    538                 return value if value is not None else SKIP_WRITE
    539             else:
--> 540                 raise InvalidUpdateError(f"Expected dict, got {input}")
    541 
    542         # state updaters

InvalidUpdateError: Expected dict, got <object object at 0x7e7b38378d10>

[soyfjimenez]

Hi!

Im facing the same issue. Did you found any way to achieve this?

[sagorbrur]

Hi @soyfjimenez ,
We tried Dill for this, but the problem is that Dill saves the graph perfectly, but it won't work after loading.
So, we are not saving the graph in a persistent disk right now, we are keeping it in memory. We are trying alternative solutions so skip these options.

regards

[jmchn]

We are having similar problem right now. We have a scenario where users can dynamically create a graph on the web ui which we persist somewhere and can load later (when user logs out and logs in later). Is that feasible in LangGraph? Is there some kind of serilization of the compiled graph?

Appreciated!