Mehak Malik

About Mehak Malik

As a Data Scientist/MLE at AdTech, Walmart, I focus on intelligent sponsored product…

Experience

1. Data Scientist

   Walmart Global Tech

   Jul 2023 — Present · Sunnyvale, CA, US

   Representation Learning- Multi-modal Semantic Ad retrieval- Built a CLIP(ViT-B-32) based retrieval embedding model for sponsored products with text-image embedding fusion to consolidate product attribute information - Trained using supervised contrastive learning frameworks incorporating user relevance signals- Significant improvement in query-item relevance by increasing production model accuracy by 8% and NDCG@5 by 8%- Accelerated inference by optimizing model architecture and deployed a real time inference module using Triton Inference Service- Received Bravo award for contributionsRepresentation Learning- Text-based Product Type Semantic Retrieval- Developed a RoBERTa-based embedding model trained using SimCSE contrastive learning framework incorporating LLM-generated Product Type context for enhanced training- Devised a use case-focused LLM-based annotation and evaluation strategy - Improved precision by 11% and NDCG@10 by 7% over current production modelGenerative AI- Apache Spark Configuration Optimization- Built a reasoning LLM-based configuration optimizer for Spark jobs evaluating cluster resource utilization information- Resulted in significant cloud compute cost savings and reduced human effort across teams - Received organization wide Excellence Award for novelty of approach