Rework grouping to deal with corner cases better #4
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- Interrupt the thread before waiting on join - Provide a method for looping threads to exit on demand - CHECK if start and stop succeed instead of returning an error
- Makes sure each solver accesses a different subset of the data - Sequential reading of DB for performance - Prefetches a configurable amount of data to host memory - Distributes data to solvers in round-robin way for determinism
- Split batches between GPUs, and tree-reduce the gradients - Detects machine topology (twin-GPU boards, P2P connectivity) - Inserts a callbak in the solver for minimal code change - Added gpus flags to caffe.cpp, e.g. '-gpus 0,1' or '-gpus all' - Deterministic architecture for reproducible runs
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Fix issues found on EC2 (no p2p support), boards with more than one ASIC, and fix p2p grouping a little better.