Portfolio: pytorch | Vitor Sousa — Senior Data Scientist & AI Engineer

RLVR from Scratch: Full LLM Alignment Pipeline

A from-scratch implementation of the full transformer → pretraining → SFT → GRPO → GDPO pipeline. Each layer built, tested, and documented. The repo is the artifact, the site is the narrative.

Personal project 🔨 In Development — Phase 1/5

LoRA and DoRA Implementation

Parameter-efficient fine-tuning from first principles — every matrix decomposition derived and implemented in PyTorch without libraries. Validated against Hugging Face PEFT outputs for correctness.

Personal project

Tailor: Size Recommendations at Farfetch Scale

Sequence classification models for personalized size prediction in luxury fashion — LSTMs, attention mechanisms, and a published paper at ACM RecSys 2023.

Farfetch 📄 ACM RecSys 2023

Projects tagged pytorch

RLVR from Scratch: Full LLM Alignment Pipeline

LoRA and DoRA Implementation

Tailor: Size Recommendations at Farfetch Scale