Stack Oveflow running Python using pythonnet on .Net #2554

luoxisteven · 2025-02-14T12:12:38Z

luoxisteven
Feb 14, 2025

I have posted this on https://stackoverflow.com/questions/79439201/stack-oveflow-running-python-and-langchain-using-pythonnet-on-net.

I'm trying to run my Python script with LangChain on .NET using PythonNet and Python.Runtime, but I keep encountering an overflow error.

Issue:
The overflow occurs at different locations depending on the vector store I use:

When using Chroma or FAISS as the vector store, the overflow occurs in:

from langchain_chroma import Chroma
or
from langchain_community.vectorstores import Chroma
or 
from langchain.vectorstores import FAISS

When using InMemoryVectorStore, the overflow happens when creating the vector store:

def _create_vectorstore(self):
    embeddings = OpenAIEmbeddings(openai_api_key=self.openai_api_key)
    # return FAISS.from_documents(self.documents, embeddings)
    return InMemoryVectorStore.from_documents(self.documents, embeddings)

and

from langchain_core.vectorstores import InMemoryVectorStore

pass without an overflow error.

When I run the same Python script directly on a Python interpreter, everything works fine without any errors, regardless of whether I use Chroma, FAISS, or InMemoryVectorStore.

What I've Tried:

Checked the overflow location multiple times.
Verified that the issue consistently occurs when importing Chroma or initializing InMemoryVectorStore.
Tried using different vector stores, but the problem persists.

My guess is that .NET imposes a memory or stack limit when running a Python script using PythonNet.

My question is:

Is there any memory limit or stack limit when .Net runs Python?
What has happened?
How can I avoid this?

Error Message:

Stack overflow.
   at Python.Runtime.Runtime.PyObject_Call(Python.Runtime.BorrowedReference, Python.Runtime.BorrowedReference, Python.Runtime.BorrowedReference)
   at Python.Runtime.PyObject.Invoke(Python.Runtime.PyTuple, Python.Runtime.PyDict)
   at Python.Runtime.PyObject.TryInvoke(System.Dynamic.InvokeBinder, System.Object[], System.Object ByRef)
   at DynamicClass.CallSite.Target(System.Runtime.CompilerServices.Closure, System.Runtime.CompilerServices.CallSite, System.Object, System.String, System.String)
   at System.Dynamic.UpdateDelegates.UpdateAndExecute3[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.Runtime.CompilerServices.CallSite, System.__Canon, System.__Canon, System.__Canon)
   at ChatbotController..ctor(Microsoft.Extensions.Configuration.IConfiguration)
   at DynamicClass.lambda_method3(System.Runtime.CompilerServices.Closure, System.IServiceProvider, System.Object[])
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider+<>c__DisplayClass6_0.<CreateControllerFactory>g__CreateController|0(Microsoft.AspNetCore.Mvc.ControllerContext)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State ByRef, Scope ByRef, System.Object ByRef, Boolean ByRef)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State ByRef, Scope ByRef, System.Object ByRef, Boolean ByRef)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeAsync()
   at Microsoft.AspNetCore.Mvc.Routing.ControllerRequestDelegateFactory+<>c__DisplayClass12_0.<CreateRequestDelegate>b__0(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware+<Invoke>d__11.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Authorization.AuthorizationMiddleware+<Invoke>d__11, Microsoft.AspNetCore.Authorization.Policy, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__11 ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Authorization.AuthorizationMiddleware+<Invoke>d__11, Microsoft.AspNetCore.Authorization.Policy, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__11 ByRef)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware+<Invoke>d__6.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Authentication.AuthenticationMiddleware+<Invoke>d__6, Microsoft.AspNetCore.Authentication, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__6 ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Authentication.AuthenticationMiddleware+<Invoke>d__6, Microsoft.AspNetCore.Authentication, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__6 ByRef)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl+<Invoke>d__14.MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl+<Invoke>d__14, Microsoft.AspNetCore.Diagnostics, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__14 ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl+<Invoke>d__14, Microsoft.AspNetCore.Diagnostics, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__14 ByRef)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequests>d__238`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequests>d__238`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequests>d__238`1<System.__Canon> ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequests>d__238`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequests>d__238`1<System.__Canon> ByRef)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](Microsoft.AspNetCore.Hosting.Server.IHttpApplication`1<System.__Canon>)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequestsAsync>d__237`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequestsAsync>d__237`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequestsAsync>d__237`1<System.__Canon> ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequestsAsync>d__237`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequestsAsync>d__237`1<System.__Canon> ByRef)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequestsAsync[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](Microsoft.AspNetCore.Hosting.Server.IHttpApplication`1<System.__Canon>)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.HttpConnection+<ProcessRequestsAsync>d__12`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.HttpConnection+<ProcessRequestsAsync>d__12`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequestsAsync>d__12`1<System.__Canon> ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.HttpConnection+<ProcessRequestsAsync>d__12`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequestsAsync>d__12`1<System.__Canon> ByRef)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.HttpConnection.ProcessRequestsAsync[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](Microsoft.AspNetCore.Hosting.Server.IHttpApplication`1<System.__Canon>)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1+<ExecuteAsync>d__8[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1+<ExecuteAsync>d__8[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ExecuteAsync>d__8<System.__Canon> ByRef)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1+<ExecuteAsync>d__8[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ExecuteAsync>d__8<System.__Canon> ByRef)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecuteAsync()
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].System.Threading.IThreadPoolWorkItem.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()
   at System.Threading.Thread.StartCallback()

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Stack Oveflow running Python using pythonnet on .Net #2554

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Stack Oveflow running Python using pythonnet on .Net #2554

luoxisteven Feb 14, 2025

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luoxisteven
Feb 14, 2025