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fix(gemma4-gguf): accept scalar attention.head_count_kv #190

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fix(gemma4-gguf): accept scalar attention.head_count_kv #190

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5 changes: 4 additions & 1 deletion python/freetoken/models/gemma4/gguf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,10 @@ def g(key: str):
num_layers = int(g("block_count"))
hidden = int(g("embedding_length"))
num_qo_heads = int(g("attention.head_count"))
kv_per_layer = g("attention.head_count_kv") # per-layer list
# llama.cpp writes head_count_kv as a SCALAR when every layer shares a KV head
# count, and only as a per-layer array when they differ (e.g. gemma-4-E2B: 1).
_kv = g("attention.head_count_kv")
kv_per_layer = [int(x) for x in _kv] if hasattr(_kv, "__len__") else [int(_kv)] * num_layers
# True -> sliding-window (SWA) layer, False -> full attention.
swa_pattern = [bool(x) for x in g("attention.sliding_window_pattern")]
assert len(swa_pattern) == num_layers, "sliding_window_pattern length != block_count"
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