triton-lang/triton

Dynmic indexing surpport?

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#707 opened on Sep 24, 2022

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help wanted

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Description

I wanna know if dynamic indexing is supported in triton. For, example, can I load a value tensor based on another index tensor instantiated at runtime like below?

indicies_ptr = index_ptr + pid_n * BLOCK_SIZE_N +  tl.arange(0, BLOCK_SIZE_N) 
indicies = tl.load(indicies_ptr)
indexed_values_ptr = value_ptr + indices
indexed_values = tl.load(indexed_values_ptr)

I've read all tutorials in the official docs, all loading is based on static indexing with tl.arange(). Before I try triton for my project, I just want to confirm if dynamic indexing is supported, this is important for my application.

Contributor guide

Research direction
Check the Triton documentation for dynamic indexing support. If unclear, examine the compiler source code to see if arbitrary index loading is allowed.
Tech stack
python
Domain
backendmachine learning
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
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
PythonTriton
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75