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llama : fix kv shift bug (#3835)

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ggml-ci
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Georgi Gerganov 2023-10-29 18:32:51 +02:00 committed by GitHub
parent d69d777c02
commit 71a09da301
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1 changed files with 18 additions and 9 deletions
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llama.cpp
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@ -1552,14 +1552,14 @@ static void llama_kv_cache_seq_shift(
for (uint32_t i = 0; i < cache.size; ++i) {
if (cache.cells[i].has_seq_id(seq_id) && cache.cells[i].pos >= p0 && cache.cells[i].pos < p1) {
cache.cells[i].pos += delta;
cache.has_shift = true;
cache.cells[i].pos += delta;
cache.cells[i].delta += delta;
if (cache.cells[i].pos < 0) {
cache.cells[i].pos = -1;
cache.cells[i].seq_id.clear();
if (new_head == cache.size) new_head = i;
} else {
cache.has_shift = true;
cache.cells[i].delta = delta;
}
}
}
@ -6073,11 +6073,20 @@ static int llama_decode_internal(
#endif
// update the kv ring buffer
lctx.kv_self.has_shift = false;
lctx.kv_self.head += n_tokens;
// Ensure kv cache head points to a valid index.
if (lctx.kv_self.head >= lctx.kv_self.size) {
lctx.kv_self.head = 0;
{
if (kv_self.has_shift) {
kv_self.has_shift = false;
for (uint32_t i = 0; i < kv_self.size; ++i) {
kv_self.cells[i].delta = 0;
}
}
kv_self.head += n_tokens;
// Ensure kv cache head points to a valid index.
if (kv_self.head >= kv_self.size) {
kv_self.head = 0;
}
}
#ifdef GGML_PERF