AlexNet competed in the ImageNet Large Scale Visual Recognition Challenge on September 30, 2012. The network achieved a top-5 error of 15.3%, more than 10.8 percentage points lower than that of the runner up. The original paper's primary result was that the depth of the model was essential for its high performance, which was computationally expensive, but made feasible due to the utilization of graphics processing units (GPUs) during training.
AlexNet was not the first fast GPU-implementation of a CNN to win an image recognition contest. A CNN on GPU by K. Chellapilla et al. (2006) was 4 times faster than an equivalent implementation on CPU. A deep CNN of Dan Cireșan et al. (2011) at IDSIA was already 60 times faster and achieved superhuman performance in August 2011. Between May 15, 2011 and September 10, 2012, their CNN won no fewer than four image competitions. They also significantly improved on the best performance in the literature for multiple image databases.
In 2015, AlexNet was outperformed by Microsoft Research Asia's very deep CNN with over 100 layers, which won the ImageNet 2015 contest.
AlexNet contained eight layers; the first five were convolutional layers, some of them followed by max-pooling layers, and the last three were fully connected layers. It used the non-saturating ReLU activation function, which showed improved training performance over tanh and sigmoid.
AlexNet is considered one of the most influential papers published in computer vision, having spurred many more papers published employing CNNs and GPUs to accelerate deep learning. As of 2021[update], the AlexNet paper has been cited over 80,000 times according to Google Scholar.
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