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KVCache

god_graph::transformer::kv_cache

Struct KVCache 

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pub struct KVCache { /* private fields */ }
Expand description

KV Cache for caching key and value states during generation

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impl KVCache

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pub fn new( num_layers: usize, max_seq_len: usize, hidden_dim: usize, num_kv_heads: usize, ) -> Self

Create a new KV cache

§Arguments
  • num_layers - Number of transformer layers
  • max_seq_len - Maximum sequence length to cache
  • hidden_dim - Hidden dimension
  • num_kv_heads - Number of KV heads (for GQA)
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pub fn update( &mut self, layer: usize, key: &DenseTensor, value: &DenseTensor, position: usize, )

Update cache with new key and value

§Arguments
  • layer - Layer index
  • key - New key [batch_size, num_kv_heads, head_dim]
  • value - New value [batch_size, num_kv_heads, head_dim]
  • position - Position to cache at
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pub fn get( &self, layer: usize, length: Option<usize>, ) -> Option<(DenseTensor, DenseTensor)>

Get cached keys and values for a layer

§Arguments
  • layer - Layer index
  • length - Number of cached positions to retrieve
§Returns

Tuple of (key_cache, value_cache) with shape [batch_size, length, num_kv_heads, head_dim]

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pub fn get_all(&self, layer: usize) -> Option<(DenseTensor, DenseTensor)>

Get all cached keys and values for a layer (full history)

§Arguments
  • layer - Layer index
§Returns

Tuple of (key_cache, value_cache)

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pub fn reset(&mut self)

Reset cache for new sequence

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pub fn current_len(&self) -> usize

Get current sequence length

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pub fn max_seq_len(&self) -> usize

Get maximum sequence length

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pub fn num_layers(&self) -> usize

Get number of layers

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pub fn hidden_dim(&self) -> usize

Get hidden dimension

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pub fn num_kv_heads(&self) -> usize

Get number of KV heads

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pub fn is_full(&self) -> bool

Check if cache is full

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pub fn remaining_capacity(&self) -> usize

Get remaining capacity

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pub fn append(&mut self, layer: usize, key: &DenseTensor, value: &DenseTensor)

Append new token’s KV without position argument (auto-increment)

§Arguments
  • layer - Layer index
  • key - New key [1, num_kv_heads, head_dim]
  • value - New value [1, num_kv_heads, head_dim]
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pub fn get_with_new( &self, layer: usize, new_key: &DenseTensor, new_value: &DenseTensor, ) -> Option<(DenseTensor, DenseTensor)>

Concatenate cached KV with new KV for attention computation

§Arguments
  • layer - Layer index
  • new_key - New key to append
  • new_value - New value to append
§Returns

Tuple of (concatenated_key, concatenated_value)

Trait Implementations§

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impl Clone for KVCache

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fn clone(&self) -> KVCache

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for KVCache

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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