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[NFC] polish colossalai/kernel/cuda_native/csrc/multihead_attention_1… #962

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Merged
binmakeswell merged 1 commit into from
May 15, 2022
Merged

[NFC] polish colossalai/kernel/cuda_native/csrc/multihead_attention_1… #962

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31 changes: 19 additions & 12 deletions colossalai/kernel/cuda_native/csrc/multihead_attention_1d.h
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Original file line number Diff line number Diff line change
Expand Up @@ -19,21 +19,25 @@
template <typename T>
class MultiHeadAttention {
public:
MultiHeadAttention(int layer_id, int max_batch_tokens, int _max_seq_len, int hidden_size,
int num_heads, float attn_dropout_ratio, float hidden_output_dropout_ratio,
MultiHeadAttention(int layer_id, int max_batch_tokens, int _max_seq_len,
int hidden_size, int num_heads, float attn_dropout_ratio,
float hidden_output_dropout_ratio,
bool pre_or_postLayerNorm);

virtual ~MultiHeadAttention();

void Forward(const T *input_ptr, const T *input_mask_ptr, T *out_ptr);

void Backward(const T *grad_output_ptr, const T *input_ptr, const T *output_ptr,
const T *input_mask_ptr, T *grad_input_ptr);
void Backward(const T *grad_output_ptr, const T *input_ptr,
const T *output_ptr, const T *input_mask_ptr,
T *grad_input_ptr);

void attn_layer_fw(const T *input_ptr, const T *input_mask_ptr, T *output_ptr, T *buffer);
void attn_layer_fw(const T *input_ptr, const T *input_mask_ptr, T *output_ptr,
T *buffer);

void attn_layer_bw(const T *input_ptr, const T *input_mask_ptr, const T *output_ptr,
const T *grad_output_ptr, T *grad_input_attn_layer_bwptr, T *buffer);
void attn_layer_bw(const T *input_ptr, const T *input_mask_ptr,
const T *output_ptr, const T *grad_output_ptr,
T *grad_input_attn_layer_bwptr, T *buffer);

void set_cur_batch_shape(int batch_size, int seq_len) {
_batch_size = batch_size;
Expand Down Expand Up @@ -83,14 +87,17 @@ class MultiHeadAttention {
}

_qkv_ptr = cuda_malloc<T>(_max_batch_tokens * _hidden_size * 3);
_soft_out_ptr = cuda_malloc<T>(_max_batch_tokens * _heads / pg_size * _max_seq_len);
_ctx_bufB_ptr = cuda_malloc<T>(_max_batch_tokens * _heads / pg_size * _max_seq_len);
_soft_out_ptr =
cuda_malloc<T>(_max_batch_tokens * _heads / pg_size * _max_seq_len);
_ctx_bufB_ptr =
cuda_malloc<T>(_max_batch_tokens * _heads / pg_size * _max_seq_len);
_attn_o_inp_ptr = cuda_malloc<T>(_max_batch_tokens * _hidden_size);

// buffer size needed by attn bw
size_t smem_size = 4 * _max_batch_tokens * _hidden_size / pg_size +
std::max(3 * _max_batch_tokens * _hidden_size / pg_size,
_max_batch_tokens * _heads / pg_size * _max_seq_len);
size_t smem_size =
4 * _max_batch_tokens * _hidden_size / pg_size +
std::max(3 * _max_batch_tokens * _hidden_size / pg_size,
_max_batch_tokens * _heads / pg_size * _max_seq_len);

if (!_shared_mem_ptr) {
cuda_free(_shared_mem_ptr);
Expand Down