[torchlib] Implement diagonal and diag

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Description

Contributor guide

Research direction

Examine existing implementations in torchlib for similar tensor operations (e.g., diag embed, diagonal scatter) and follow the pattern to add diagonal and diag functions. Also, check the PyTorch ONNX symbolic for reference.

Tech stack

python

Domain

machine learning

Issue type

Feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Clear

Prerequisites

PythonGit

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

60