train on a custom dataset

[mikeyEcology]

Hi, Thank you for producing this repository. It is very impressive that you are able to achieve these results with such small sample size. I'd like to train a similar model on my dataset, which includes only three classes, but the object I want to detect is very difficult to see (it's very small and moves quickly and sporadically). I need to use multiple annotated videos for each class, but in the Davis dataset there is only one video for each class. How could I use multiple videos for each class instead? Also, since the object I'm looking for is very small and hard to see, could I provide some videos where there is no object at all (the segmentation mask would be blank). I'm not clear on how I would do this given the current configuration.