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learner$train() informative error for incorrect sampler #433

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Merged
sebffischer merged 3 commits into from
Sep 19, 2025
Merged

learner$train() informative error for incorrect sampler #433

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Sep 5, 2025
f432c0b
informative error
Sep 5, 2025
648f1aa
clarify ()
Sep 5, 2025
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3 changes: 3 additions & 0 deletions R/learner_torch_methods.R
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Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,9 @@ train_loop = function(ctx, cbs) {
while (ctx$step < length(ctx$loader_train)) {
ctx$step = ctx$step + 1
ctx$batch = dataloader_next(train_iterator)
if (is.null(ctx$batch)) {
stop("dataloader_next() returned NULL, which means there are no more samples/batches. Typically this occurs when length of sampler/batch_sampler is greater than the number of samples/batches. Please modify .length() method to return the correct number (samples for sampler, batches for batch_sampler), which should be equal to the number of times that .iter() can be called before returning coro::exhausted()")
}
ctx$batch$x = lapply(ctx$batch$x, function(x) x$to(device = ctx$device))
ctx$batch$y = ctx$batch$y$to(device = ctx$device)
ctx$optimizer$zero_grad()
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