OHEM：Training Region-based Object Detectors with Online Hard Example Mining

論文：Training Region-based Object Detectors with Online Hard Example Mining official code - caffe：https://github.com/abhi2610/ohem 1. hard example 顧名思義，難例，即檢測困難的正樣本，與 easy example相對，一般指訓練過程中誤分的樣本。 2. 核心

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