This document discusses accelerating machine learning applications over Spark on Pynq. It describes using FPGAs to accelerate logistic regression, a popular machine learning technique. The authors developed SPynq, which integrates Spark with Pynq to run Spark applications on Zynq systems. Their implementation achieves up to 21x higher energy efficiency compared to software-only solutions. Evaluation shows the FPGA accelerator provides significant speedups over CPUs and ARM for logistic regression. The work is part of the VINEYARD project, which aims to build an integrated platform for energy-efficient data centers using programmable hardware accelerators.