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minor fix comment in engine

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This commit is contained in:
Andrej Karpathy 2025-11-13 15:28:18 +00:00
parent adb5d4a16c
commit 91f09ccd0d
1 changed files with 2 additions and 1 deletions
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nanochat/engine.py
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@ -107,8 +107,9 @@ class KVCache:
assert self.kv_cache is None, "Cannot prefill a non-empty KV cache"
assert other.kv_cache is not None, "Cannot prefill with a None KV cache"
for ix, (dim1, dim2) in enumerate(zip(self.kv_shape, other.kv_shape)):
# ix 0: num_layers, 1: k/v, 2: batch_size, 3: num_heads, 4: seq_len, 5: head_dim
if ix in [0, 1, 3, 5]:
# num_layers, batch_size, num_heads, head_dim must match
# num_layers, k/v, num_heads, head_dim must match
assert dim1 == dim2, f"Dim {ix} mismatch: {dim1} != {dim2}"
elif ix == 2:
# batch_size can be expanded