The availability of large datsets has enabled neural networks to achieve impressive recognition results. However, the presence of inaccurate class labels is known to deteriorate the performance of even the best classifiers in a broad range of classification problems. Noisy labels also tend to be more harmful than noisy attributes. When the observed label is noisy, we can view the correct label as a latent random variable and model the noise processes by a communication channel with unknown parameters. Thus we can apply the EM algorithm to find the parameters of both the network and the noise and estimate the correct label. In this study we present a neural-network approach that optimizes the same likelihood function as optimized by the EM algorithm. The noise is explicitly modeled by an additional softmax layer that connects the correct labels to the noisy ones. This scheme is then extended to the case where the noisy labels are dependent on the features in addition to the correct labels. Experimental results demonstrate that this approach outperforms previous methods.
|State||Published - 2017|
|Event||5th International Conference on Learning Representations, ICLR 2017 - Toulon, France|
Duration: 24 Apr 2017 → 26 Apr 2017
|Conference||5th International Conference on Learning Representations, ICLR 2017|
|Period||24/04/17 → 26/04/17|
Bibliographical noteFunding Information:
This work is supported by the Intel Collaborative Research Institute for Computational Intelligence (ICRI-CI).
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