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[Inference/Feat] Feat quant kvcache step2 (#5674)

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傅剑寒
2024-04-30 11:26:36 +08:00
committed by GitHub
parent 8ccb6714e7
commit 808ee6e4ad
4 changed files with 208 additions and 71 deletions
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126
extensions/csrc/kernel/cuda/context_kv_cache_memcpy_kernel.cu
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@@ -4,16 +4,17 @@
#include "utils/vec_copy.h"
#include "common/micros.h"
using colossalAI::cuda::utils::copy_vector;
using colossalAI::cuda::utils::get_vec_size;
using colossalAI::cuda::utils::copy;
using colossalAI::funcs::CastFunctor;
template<typename scalar_t, bool Aligned, int VecSize>
template<typename T, typename CacheT, bool Aligned, int VecSize>
__global__ void context_kv_cache_memcpy_kernel(
const scalar_t* __restrict__ key,
const scalar_t* __restrict__ value,
scalar_t* __restrict__ key_cache,
scalar_t* __restrict__ value_cache,
const T* __restrict__ key,
const T* __restrict__ value,
CacheT* __restrict__ key_cache,
CacheT* __restrict__ value_cache,
const int* __restrict__ sequence_lengths,
const int* __restrict__ cu_seqlens,
const int* __restrict__ block_tables,
@@ -54,8 +55,8 @@ __global__ void context_kv_cache_memcpy_kernel(
+ head_id * block_size * head_dim
+ block_offset * head_dim + head_offset;
copy_vector<scalar_t, VecSize>(key_cache + target_id, key + key_src_id);
copy_vector<scalar_t, VecSize>(value_cache + target_id, value + value_src_id);
copy<T, CacheT, VecSize>(key + key_src_id, key_cache + target_id);
copy<T, CacheT, VecSize>(value + value_src_id, value_cache + target_id);
}
// tail process
@@ -69,22 +70,22 @@ __global__ void context_kv_cache_memcpy_kernel(
+ head_id * block_size * head_dim
+ block_offset * head_dim + head_offset;
key_cache[target_id] = key[key_src_id];
value_cache[target_id] = value[value_src_id];
key_cache[target_id] = CastFunctor<T, CacheT>()(key[key_src_id]);
value_cache[target_id] = CastFunctor<T, CacheT>()(value[value_src_id]);
}
}
}
template<typename scalar_t>
template<typename T, typename CacheT>
void apply_context_kv_cache_memcpy(
at::Tensor& key, // [num_tokens, head_num, head_dim]
at::Tensor& value, // [num_tokens, head_num, head_dim]
at::Tensor& key_cache, // [num_blocks, head_num, block_size, head_dim]
at::Tensor& value_cache, // [num_blocks, head_num, block_size, head_dim]
at::Tensor& sequence_lengths, // [batch_size]
at::Tensor& cu_seqlens, // [batch_size + 1]
at::Tensor& block_tables, // [batch_size, max_seq_len]
torch::Tensor& key, // [num_tokens, head_num, head_dim]
torch::Tensor& value, // [num_tokens, head_num, head_dim]
torch::Tensor& key_cache, // [num_blocks, head_num, block_size, head_dim]
torch::Tensor& value_cache, // [num_blocks, head_num, block_size, head_dim]
torch::Tensor& sequence_lengths, // [batch_size]
torch::Tensor& cu_seqlens, // [batch_size + 1]
torch::Tensor& block_tables, // [batch_size, max_seq_len]
int max_seq_len_in_batch)
{
int num_tokens = key.size(0);
@@ -97,7 +98,7 @@ void apply_context_kv_cache_memcpy(
int64_t value_stride = value.stride(0);
int block_table_stride = block_tables.stride(0);
int vec_size = get_vec_size<scalar_t>(key);
int vec_size = get_vec_size<T>(key);
bool aligned = true;
if (head_dim % vec_size != 0) {
@@ -112,11 +113,11 @@ void apply_context_kv_cache_memcpy(
#define CONTEXT_KV_CACHE_MEMCOPY_KERNEL_LAUNCH(__aligned, __vec_size) \
do { \
context_kv_cache_memcpy_kernel<scalar_t, __aligned, __vec_size><<<grid, block, 0, stream>>>( \
key.data_ptr<scalar_t>(), \
value.data_ptr<scalar_t>(), \
key_cache.data_ptr<scalar_t>(), \
value_cache.data_ptr<scalar_t>(), \
context_kv_cache_memcpy_kernel<T, CacheT, __aligned, __vec_size><<<grid, block, 0, stream>>>( \
reinterpret_cast<T*>(key.data_ptr()), \
reinterpret_cast<T*>(value.data_ptr()), \
reinterpret_cast<CacheT*>(key_cache.data_ptr()), \
reinterpret_cast<CacheT*>(value_cache.data_ptr()), \
sequence_lengths.data_ptr<int>(), \
cu_seqlens.data_ptr<int>(), \
block_tables.data_ptr<int>(), \
@@ -161,26 +162,63 @@ void apply_context_kv_cache_memcpy(
}
void context_kv_cache_memcpy(
at::Tensor& key, // [num_tokens, head_num, head_dim]
at::Tensor& value, // [num_tokens, head_num, head_dim]
at::Tensor& key_cache, // [num_blocks, head_num, block_size, head_dim]
at::Tensor& value_cache, // [num_blocks, head_num, block_size, head_dim]
at::Tensor& sequence_lengths, // [batch_size]
at::Tensor& cu_seqlens, // [batch_size + 1]
at::Tensor& block_tables, // [batch_size, max_seq_len]
torch::Tensor& key, // [num_tokens, head_num, head_dim]
torch::Tensor& value, // [num_tokens, head_num, head_dim]
torch::Tensor& key_cache, // [num_blocks, head_num, block_size, head_dim]
torch::Tensor& value_cache, // [num_blocks, head_num, block_size, head_dim]
torch::Tensor& sequence_lengths, // [batch_size]
torch::Tensor& cu_seqlens, // [batch_size + 1]
torch::Tensor& block_tables, // [batch_size, max_seq_len]
int max_seq_len_in_batch)
{
DISPATCH_FLOAT_HALF_AND_BFLOAT(
key.scalar_type(),
"context_kv_cache_memcpy",
apply_context_kv_cache_memcpy<scalar_t>(
key,
value,
key_cache,
value_cache,
sequence_lengths,
cu_seqlens,
block_tables,
max_seq_len_in_batch
);)
TORCH_CHECK(key.scalar_type() == at::ScalarType::Float || key.scalar_type() == at::ScalarType::Half || key.scalar_type() == at::ScalarType::BFloat16,
"Dtype of key should be float, half or bfloat16!");
TORCH_CHECK(key_cache.scalar_type() == at::ScalarType::Byte || key_cache.scalar_type() == key.scalar_type(),
"Dtype of query and kvcache should be the same unless dtype of kvcache is fp8!");
#define _(T, CacheT) \
apply_context_kv_cache_memcpy<T, CacheT>( \
key, \
value, \
key_cache, \
value_cache, \
sequence_lengths, \
cu_seqlens, \
block_tables, \
max_seq_len_in_batch \
)
if(key_cache.scalar_type() == at::ScalarType::Byte)
{
switch (key.scalar_type())
{
case at::ScalarType::Float:
_(float, uint8_t);
break;
case at::ScalarType::Half:
_(half, uint8_t);
break;
case at::ScalarType::BFloat16:
_(__nv_bfloat16, uint8_t);
break;
}
}
else
{
switch (key.scalar_type())
{
case at::ScalarType::Float:
_(float, float);
break;
case at::ScalarType::Half:
_(half, half);
break;
case at::ScalarType::BFloat16:
_(__nv_bfloat16, __nv_bfloat16);
break;
}
}
#undef _
}

2
extensions/csrc/kernel/cuda/flash_decoding_attention_kernel.cu
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@@ -372,7 +372,7 @@ void flash_decoding_attention(
TORCH_CHECK(query.scalar_type() == at::ScalarType::Float || query.scalar_type() == at::ScalarType::Half || query.scalar_type() == at::ScalarType::BFloat16,
"Dtype of query should be float, half or bfloat16!");
TORCH_CHECK(key_cache.scalar_type() == at::ScalarType::Byte || key_cache.scalar_type() == key_cache.scalar_type(),
TORCH_CHECK(key_cache.scalar_type() == at::ScalarType::Byte || key_cache.scalar_type() == query.scalar_type(),
"Dtype of query and kvcache should be the same unless dtype of kvcache is fp8!");
if(key_cache.scalar_type() == at::ScalarType::Byte)

31
extensions/csrc/kernel/cuda/utils/vec_copy.h
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@@ -11,10 +11,9 @@ namespace colossalAI {
namespace cuda {
namespace utils {
template <typename T, int VecSize>
template <typename T, int vec_size>
__device__ __inline__ void copy_vector(T *dst, const T *src) {
using VT = typename common::VecTypeTrait<T, VecSize>::Type;
// Note(LiuYang): Here static_cast can't be used for cast between two pointer
using VT = typename common::VecTypeTrait<T, vec_size>::Type;
*(reinterpret_cast<VT *>(dst)) = *(reinterpret_cast<const VT *>(src));
}
@@ -33,9 +32,33 @@ __device__ __inline__ void copy_zero_vector(T *dst) {
*(reinterpret_cast<VT *>(dst)) = funcs::CastFunctor<float, VT>()(0.0f);
}
template <typename SrcT, typename DstT, int vec_size>
__device__ __inline__ void copy(const SrcT *src, DstT *dst) {
using SrcVT = typename common::VecTypeTrait<SrcT, vec_size>::Type;
using DstVT = typename common::VecTypeTrait<DstT, vec_size>::Type;
// Note(LiuYang): Here static_cast can't be used for cast between two pointer
*(reinterpret_cast<DstVT *>(dst)) = funcs::CastFunctor<SrcVT, DstVT>()(
*(reinterpret_cast<const SrcVT *>(src)));
}
template <typename T, int vec_size>
__device__ __inline__ void copy<T, T, vec_size>(const T *src, T *dst) {
using VT = typename common::VecTypeTrait<T, vec_size>::Type;
*(reinterpret_cast<VT *>(dst)) = *(reinterpret_cast<const VT *>(src));
}
template <>
__device__ __inline__ void copy<float, float, 8>(const float *src, float *dst) {
// Since the maximum memory alignment length is 128 bits, we choose float4
// here.
*(reinterpret_cast<float4 *>(dst)) = *(reinterpret_cast<const float4 *>(src));
*(reinterpret_cast<float4 *>(dst + 4)) =
*(reinterpret_cast<const float4 *>(src + 4));
}
template <typename T>
int get_vec_size(const torch::Tensor &tensor) {
uint64_t address = reinterpret_cast<uint64_t>(tensor.data_ptr<T>());
uint64_t address = reinterpret_cast<uint64_t>(tensor.data_ptr());
const int max_aligned_size = 128;
const int dtype_size = sizeof(T) * 8;