Luis Quintanilla luisquintanilla

Tensor slice pinning repro

A contiguous tensor slice returns the expected values through its indexer and tensor span, but its pinning APIs start at the parent array.

I found this while prototyping tensor interoperability for a .NET ONNX text-embedding pipeline. The repro removes ONNX and only uses System.Numerics.Tensors. No model, project file, or other source files are needed.

Run the repro

Download TensorSlicePinning.cs into a new directory outside a repository:

	#:package System.Numerics.Tensors@10.0.9
	#:package Microsoft.ML.OnnxRuntime@1.23.2
	#:property TargetFramework=net10.0
	#:property PublishAot=false

	using System.Numerics.Tensors;
	using System.Runtime.CompilerServices;
	using Microsoft.ML.OnnxRuntime;

	Console.WriteLine($"Runtime: {System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription}");

	#:package TensorSharp.Models@2026.9.1
	#:property PublishAot=false

	using TensorSharp.Models;
	using TensorSharp.Runtime;

	Environment.SetEnvironmentVariable("MAX_CONTEXT", "512");
	using var model = ModelBase.Create("qwen3-0.6b-q4_k_m.gguf", BackendType.Cpu);
	var email = "Payroll asks for your password on a non-company sign-in page.";

	// 00-problem-baseline.cs
	// SPIKE 0 — Prove or KILL hypothesis H1.
	//
	// H1: With MEDI PR #7516's current first-wins metadata propagation, a chunk that spans
	// multiple source pages produces a WRONG/INCOMPLETE source citation, AND the typed
	// PageNumber (the field that actually matters for citation) is dropped entirely.
	//
	// JTBD under test: "Given a retrieved chunk, what page(s) of the source does it cite?"
	// This is the #1 production-RAG requirement (legal/medical/financial attribution).
	//

	[Description("Calculate tax given a receipt and tax rate")]
	float CalculateTax(float total, float taxRate)
	{
	return total * (1 + taxRate);
	}

	ILoggerFactory loggerFactory = LoggerFactory.Create(builder =>
	{
	builder.SetMinimumLevel(LogLevel.Trace).AddConsole();
	});