7. Ray Data# 7.1. Ray Data Overview Key Concepts Dataset Data Operations and Underlying Implementation Data Reading and Writing Data Transformation 7.2. Data Loading, Inspection, and Saving Loading Data Column and Row Pruning Parallelism Inspecting Data Iterating Over Data Sequential Iterating Randomly Iterating Saving Data Writing to Filesystems Converting to Other Framework Formats 7.3. Data Transformation Transformation map() and map_batches() Example: NYC Taxi Task and Actor Grouping 7.4. Preprocessor