Hi JaeGer.
You means each data has 460 dimension feature and each sample associated with date?  And，could you give more detail about your features, like what kinds of feature? or your features are just from hidden output from another promgram?
Well, all I can thought is you can attemp to RNN(LSTM or GRU) to utilize the information of date, followed by fully connected layer and auto_grad with CrossEntropy.
If more detail，It’s useful to give better advise.
Good luck.