Autonomous rail rapid transit (ART) is a lidar (light detection and ranging) guided bi-articulated bus system for urban passenger transport.

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The Interborough Rapid Transit Company (IRT) was the private operator of New York City 's original underground subway line that opened in 1904, as well as earlier elevated railways and additional rapid transit lines in New York City. [2] .

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It is caused by automatic checkpoint saving of PyTorch lightning (PL) as PL saves the last checkpoint when the training is exited by error. In this case, the checkpoint saving callback did not work since there was no val/the_metric, which not exists before the first validation.

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