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Merge pull request #17 from TastyHeadphones/tastyheadphones/short-dataset-underflow-fix 

Fix token sampling underflow for short token datasets
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Manjeet Singh 2026-03-04 17:48:22 +05:30 committed by GitHub
parent 4a6f3e40a9 2b3b7ae5cc
commit 3efa27d7a3
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1 changed files with 11 additions and 5 deletions
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16
training/train_large.m
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@ -286,11 +286,17 @@ int main(int argc, char *argv[]) {
int data_fd = open(DATA_PATH, O_RDONLY);
if (data_fd < 0) { printf("Cannot open %s\n", DATA_PATH); return 1; }
struct stat st; fstat(data_fd, &st);
size_t data_len = st.st_size;
uint16_t *token_data = (uint16_t*)mmap(NULL, data_len, PROT_READ, MAP_PRIVATE, data_fd, 0);
if (token_data == MAP_FAILED) { printf("mmap failed\n"); return 1; }
size_t n_tokens = data_len / 2;
printf("Token data: %zu tokens (%.1f MB)\n", n_tokens, data_len/1e6);
size_t data_len = st.st_size;
uint16_t *token_data = (uint16_t*)mmap(NULL, data_len, PROT_READ, MAP_PRIVATE, data_fd, 0);
if (token_data == MAP_FAILED) { printf("mmap failed\n"); return 1; }
size_t n_tokens = data_len / 2;
if (n_tokens <= (size_t)(SEQ + 1)) {
printf("Token data too short: need at least %d tokens, got %zu\n", SEQ + 2, n_tokens);
munmap(token_data, data_len);
close(data_fd);
return 1;
}
printf("Token data: %zu tokens (%.1f MB)\n", n_tokens, data_len/1e6);
// Gradient buffers shared across layers (reused each step)
float *dy = (float*)malloc(SEQ*DIM*4); // gradient flowing backward