I'm Ali Rahimian, and I recently received my M.S. in Computer Science from UNC Charlotte, where I was a graduate research assistant at the Charlotte Machine Learning Lab (CharMLab). My research focused on sparse attention, efficient Transformer models, and visual representation learning, including work on Fibottention and TruthLens (ICML 2025).

Some highlights from my CV:

• Honorable Mention — 17th ACM ICPC Asia Tehran Regional Contest (Nov 2019)
• 2nd Place — JCAL Programming Contest (May 2018)
• 3rd Place — Sharif ICT Fintech Hackathon (Aug 2019)
• 4th Place — Sharif Obfuscated C Code Contest (Dec 2019)
• 10th Place — JavaCup Programming Contest (Oct 2019)
• 31st Place — Mobile Apps Programming Hackathon (Sep 2019)

• fibottention — Inceptive Visual Representation Learning with Diverse Attention Across Heads
• sparse-attention-benchmark-suite — A Comprehensive Benchmark of Sparse Attention Mechanisms in Vision Transformers
• attention-is-all-you-need — Attention Is All You Need: A PyTorch Implementation from Scratch
• fine-grained-pruning — Fine-grained Pruning
• linear-quantization-vgg — Linear Quantization

• accelerated-gradient — Accelerated Gradient Methods: Momentum, Nesterov, and When Theory Misbehaves
• gradient-descent-lab — Gradient Descent Lab: Methods and Empirical Behavior
• jina — Genetic & simulated annealing optimization
• ridge-hyperparam-sweep — Ridge Regression Hyperparameter Sweep
• logreg-naive-bayes — ML Classifiers: Logistic Regression (GD/IRLS) + Naive Bayes (Gaussian/Bernoulli)
• nonlinear-2d-classifier — Nonlinear Decision Boundaries with a Two-Layer Neural Network

• sparxiv — A Spark-Based Recommender System for arXiv
• aws-serverless-data-analytics-pipeline — AWS Serverless Data Analytics Pipeline
• aws-ecommerce-analytics-s3-glue-athena-pipeline — AWS E-Commerce Analytics Pipeline (S3 • Glue • Athena)
• spark-structured-streaming — Ride Sharing Analytics Using Spark Structured Streaming & Spark SQL
• spark-music-streaming-analysis — Music Streaming Analysis Using Spark Structured APIs
• jaccard-mapreduce — Jaccard Similarity with Hadoop MapReduce
• hadoop-mapreduce-wordcount — Hadoop-MapReduce-WordCount
• docker — Flask + Redis with Docker Compose
• docker-containers — Docker Containers

• cuda-openmp-nbody-simulation — Parallel N Body Simulation: Sequential, OpenMP, and CUDA Implementations
• cuda-h2d-d2h-bandwidth-study — CUDA H2D/D2H Bandwidth Study
• mergesort-parallelization-study — Merge Sort: Parallelization Study
• prefixsum-openmp-benchmark — Parallel Prefix Sum With OpenMP
• data-processing — Fast transaction data processing with SQLite
• parallel-computation — Blockchain transaction concurrency

• ctrl — CTRL: Cross-Task Reinforcement Learning
• carracing-ppo — CarRacing PPO (Gymnasium + Stable-Baselines3)
• pong-dqn — Pong DQN: Deep Q-Learning on Atari Pong
• frozenlake-qlearning — FrozenLake Q-Learning
• lunarlander-ppo — LunarLander Proximal Policy Optimization
• lunarlander-dqn-per-noise — LunarLander DQN: Prioritized Replay + Parameter Noise
• pacman-pathfinding— Pac-Man RL agent with BFS/DFS/A* heuristics
• alpha-beta-pruning — Optimal decision-making with minimax pruning

• truthlens — TruthLens: Training-Free Data Verification for Deepfake Images via VQA-style Probing (ICML 2025)
• watershed — Image segmentation with Watershed algorithm
• oneshot-openclip-tta — One-Shot Classification with OpenCLIP + Test-Time Prototype Adaptation
• moco-joint-ssl-training — SSL-First Image Classification (MoCo + Joint Optimization)
• vit-transfer-learning-pipeline — Transfer Learning for Maximum Accuracy: ViT Fine-Tuning Pipeline
• mnist-simplenet-pytorch — MNIST SimpleNet with PyTorch
• opencv-tracking-algorithms — Real-time tracking (CAMShift, Lucas-Kanade, KCF, etc.)
• ira — Real-time keypoint detection (face, eyes, edges)
• hsfc — Hand segmentation & finger counting with convex hull
• kcnn — CNN for image classification (TensorFlow/Keras, MNIST)

• competitive-programming — ACM-ICPC problems & algorithm design
• Profiles
  • Codeforces: https://codeforces.com/profile/Ali811
  • Timus Online Judge: https://acm.timus.ru/author.aspx?id=238630

• tcp-socket — TCP-based messenger
• aes-encryption — AES encryption/decryption

• jaga — 2D/3D Android game development framework
• ase — Local search engine with TF-IDF and n-grams
• ezpark — Campus parking spot availability app
• Discord bots:
  • Utility: community-votes, temp-vc, threads, infinity-bot, melody-cafe, owl, english-cafe
  • Minigames: game-of-life, bomb-party, find-the-spy