facebookresearch/fairseq

Add an option to disable appending eos to the end of each document while preprocessing

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#5,615 opened on May 26, 2025

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enhancementhelp wantedneeds triage

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Description

🚀 Feature Request

Add an option to disable appending EOS to the end of each document while preprocessing

Motivation

There are instances where adding EOS is not preferred like when packing data to sequence length.

Pitch

Proposing a change to add an argument to handle this

Contributor guide

Research direction
Examine the preprocessing module in fairseq to find where EOS is appended and add a configuration option to disable it.
Tech stack
python
Domain
backendmachine 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.
Half day
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.
Mostly clear
Prerequisites
Python
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60