question about train_data and validation_data

[Tingwei Liu]

hi
I have some problem with train_data and validation_data.
I want to run this algorithm(Darts) to datasets A ,which is have 2000 picture, validate to dataset B, which is have 400 picture,
However, I noticed that in your code about the setting of the validation set, you split the training set in two and use a part for validation. Sorry, this part of the gradient calculation is not too clear to me.
i can't not figure out this part

# phase 2. architect step (alpha) alpha_optim.zero_grad() architect.unrolled_backward(trn_X, trn_y, val_X, val_y, lr, w_optim) alpha_optim.step()

and

# compute gradient v_alphas = tuple(self.v_net.alphas()) v_weights = tuple(self.v_net.weights()) v_grads = torch.autograd.grad(loss, v_alphas + v_weights) torch.nn.utils.clip_grad_norm_(v_grads, 5.) dalpha = v_grads[:len(v_alphas)] dw = v_grads[len(v_alphas):]

so, how can i run this algorithm(Darts) to datasets A , validate to dataset B ,
any suggestion will appreciate

[SherwoodZheng]

Please kindly refer the original paper, https://arxiv.org/pdf/1806.09055.pdf
The darts code is modified from https://github.com/khanrc/pt.darts and https://github.com/quark0/darts. If you have any questions about the search code, feel free to make issues in the original code repo.