ds: r9

ds/25-1/3/README.md

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+h
+
+Some categorical features, such as `event_type`, `category_code`, `brand`, and etc. are stored as raw text.
+Dask > cuDF if dataset doesn't fit into memory
+none of the optimizations introduced by Dask-CUDA will be available in such cases (without dask_cuda.LocalCUDACluster())
+dask.distributed.Client
+spilling uses host <memory_limit> when <device_memory_limit> is reached