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PRD + Tech Spec — .NET NuGet “Model Fetch + Cache” System (HuggingFace default, configurable source, optional MSBuild prefetch)

1. Problem Statement

We ship a .NET NuGet package that uses an AI model. The model can be large (100MB–multiple GB). Putting the model inside the NuGet package is a bad fit (slow restore, duplicated storage per version, plan quotas, painful CI).

We need a robust, boring, predictable way to:

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#:package Microsoft.Extensions.AI.OpenAI@10.1.1-preview.1.25612.2

using Microsoft.Extensions.AI;
using OpenAI;

var key = Environment.GetEnvironmentVariable("OPENAI_KEY");

IChatClient chatClient = 
    new OpenAIClient(key)
        .GetChatClient("gpt-4o-mini")

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#r "nuget:Microsoft.ML"
#r "nuget:Microsoft.ML.Vision"
#r "nuget:Microsoft.ML.ImageAnalytics"
#r "nuget:SciSharp.TensorFlow.Redist" 

open System
open System.IO
open Microsoft.ML
open Microsoft.ML.Data
open Microsoft.ML.Vision

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Data loading

• IDataView (ML.NET)
• .NET for Apache Spark
• FSharp.Data
• Deedle

Data wrangling

• Deedle

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sudo apt update && sudo apt install git dkms

cd Downloads

git clone -b extended --single-branch https://github.com/lwfinger/rtlwifi_new.git
unofficial

cd rtlwifi_new
make 
sudo make install

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//Try this
type Folder = { 
    Name:string
    Size:int64
    NumFiles:int64
    AvgSize:float
    DistinctExt:string list
}

open System.IO

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/*
write a program that outputs the largest unique set of characters that can be removed 
from this paragraph without letting its length drop below 50. 
For example: [‘H’, ‘i’, ‘!’, ‘ ’]
*/

//Exception based on paragraph length
function ParagraphLengthException(message){
    this.name = "ParagraphLengthException"
    this.message = message; 

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using System;

namespace authtest
{
    class AccessToken
    {
        public string access_token { get; set; }
        public string token_type { get; set; }
        public long expires_in { get; set; }
    }