Okay so maybe my confusion comes about because I am looking at a special case. In my case I just have a long timeseries that represents a long trajectory of some object. I dont have any predefined division of that timeseries into subsections like e.g. sentences of a long text. So I can choose that division myself and I want all subsection to be of same length. And that length is my batchsize. I.e., I have a 5D timeseries of 1000 recordings and instead of plugging it in as a whole I will draw randomly samples of size 100 (=batchsize) and plug it into the RNN. In that case what would be the respective seq_len, batch, input_size?