What does the error message "Fastai error: batch sizes do not match. ValueError: The expected input batch size (6912) does not match the target batch size (128)" mean?

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The error message means that the expected input batch size of 6912 does not match the target batch size of 128. It could mean that the data is not properly formatted or that there is an issue with the input and target data being passed to the model. It may also suggest that the batch sizes need to be adjusted to match each other for the model to work properly.