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GraniteSWA

docs/source/en/model_doc/granite_swa.md

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This model was contributed to Hugging Face Transformers on 2026-07-29.

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GraniteSWA

GraniteSWA is a Granite variant that adds two changes for more memory-efficient long-context inference:

  • Per-layer sliding window attention. Each layer is either "full_attention" or "sliding_attention" (configured by layer_types). By default every fourth layer (i % 4 == 0) keeps full attention and the rest attend only to the most recent sliding_window tokens.
  • Learnable per-head attention sinks. Each head learns a scalar sink that rescales its attention output by sigmoid(logsumexp(attn_logits) - sink). This is mathematically equivalent to appending a single extra learnable logit to the softmax denominator (the attention-sink mechanism used by GPT-OSS).

[!TIP] SDPA is not supported because the attention sink cannot be expressed through torch.nn.functional.scaled_dot_product_attention. Supported backends are:

  • Training + inference: "eager", "flex_attention" (preferred for training)
  • Inference: "flash_attention_3" (via vLLM FA3 'hub' kernel — also the fallback when FlashAttention-3 is not installed but kernels is), "flash_attention_4"

The example below demonstrates how to generate text with [Pipeline] or the [AutoModelForCausalLM] class.

<hfoptions id="usage"> <hfoption id="Pipeline">
python
from transformers import pipeline


pipe = pipeline(
    task="text-generation",
    model="ibm-granite/granite-swash-2b",
)
pipe("Explain quantum computing in simple terms", max_new_tokens=50)
</hfoption> <hfoption id="AutoModel">
python
from transformers import AutoModelForCausalLM, AutoTokenizer


tokenizer = AutoTokenizer.from_pretrained("ibm-granite/granite-swash-2b")
model = AutoModelForCausalLM.from_pretrained(
    "ibm-granite/granite-swash-2b",
    device_map="auto",
    # eager default, also supports "flex_attention", "flash_attention_3", "flash_attention_4"
    attn_implementation="eager",
)

inputs = tokenizer("Explain quantum computing in simple terms", return_tensors="pt").to(model.device)
outputs = model.generate(**inputs, max_new_tokens=50)
print(tokenizer.decode(outputs[0], skip_special_tokens=True))
</hfoption> </hfoptions>

GraniteSWAConfig

[[autodoc]] GraniteSWAConfig

GraniteSWAModel

[[autodoc]] GraniteSWAModel - forward

GraniteSWAForCausalLM

[[autodoc]] GraniteSWAForCausalLM - forward