Distribute PathoROB feature extraction across GPUs#6
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PathoROB was running feature extraction on a single GPU while N-1 GPUs sat idle. Switch to the same distributed pattern as StandardProbePlugin: DistributedSampler + extract_multiple_features with all_gather. Metric computation (RI, APD, clustering) stays main-process-only. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
DistributedSampler+extract_multiple_features(withall_gather), matchingStandardProbePlugin's existing pattern. Previously N-1 GPUs sat idle during PathoROB evaluation.Test plan
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