El Bruno

Hi!

Today I’m going to leave this POST as a memory backup for me because I always forget to make this configuration in ML.Net projects and I always find the following error:

System.InvalidOperationException

  HResult=0x80131509

  Message=Entry point ‘<some external assembly> not found

  Source=Microsoft.ML.Data

Where [External Assembly] can be For example LightGBM

  Message=Entry point ‘Trainers.LightGbmClassifier’ not found

This error triggered when the app is running, at the beginning of a pipeline training. It is usually associated with scenarios where we add and use external references in addition to Microsoft.ML.

The solution is quite simple, we just have to make sure that the Project Property <CopyLocalLockFileAssemblies> this enabled

Editing the csproj file like this

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup Label="Globals">
    <SccProjectName>SAK</SccProjectName>
    <SccProvider>SAK</SccProvider>
    <SccAuxPath>SAK</SccAuxPath>
    <SccLocalPath>SAK</SccLocalPath>
  </PropertyGroup>
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.1</TargetFramework>
    <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
  </PropertyGroup>

And ready, now our pipelines can train properly!

Happy Coding!

Greetings @ Burlington

El Bruno

References

• ML.Net Homepage
• Announcing ML.NET 0.5

My Posts

• Adding NuGet Packages in Preview mode from MyGet, ie: Microsoft.ML-0.6.0 Version
• ML.Net 0.5 initial support for TensorFlow
• New version 0.4, news Improvements in Text analysis using Word Embedding
• Error ‘Entry point ‘Trainers.LightGbmClassifier’ not found’ and how to fix it
• Machine Learning Glossary of terms
• Export Machine Learning.Net models to ONNX format
• Loading Data In our Learning Pipeline With List (Lists for ever!)
• What’s new in version 0.2.0
• What’s a Machine Learning model? A 7 minute video as the best possible explanation
• Write and Load models using Machine Learning .Net
• Understanding the step by step of Hello World
• Hello World in ML.Net, Machine Learning for .Net !