is there any advice for training in kaggle when your input images are a variety of dimensions? A lot

is there any advice for training in kaggle when your input images are a variety of dimensions? A lot of my training images are larger than 512512 but smaller than 10241024, and not necesarily square. Resizing them can give them unrealistic/stretched proportions, not sure if that might impact the training? or is it not possible to train these?
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