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# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: Apache-2.0
# DeepSpeed Team
from deepspeed import comm as dist
global num_kv_heads
def set_num_kv_heads(num):
global num_kv_heads
num_kv_heads = num
def set_n_embd(num):
global n_embd
n_embd = num
def get_num_kv_heads():
global num_kv_heads
return num_kv_heads
def get_shard_size(total_size, mp_size, name=None, rank=None):
global num_kv_heads
last_linear = ["lm_head", "embed_out"]
# When we have num_kv_heads defined, uneven division is possible, otherwise enforce near even division
if rank == None:
rank = dist.get_rank()
if num_kv_heads != None and total_size % num_kv_heads == 0 and "mlp" not in str(name) and str(
name) not in last_linear:
my_slices = (num_kv_heads // mp_size) + (1 if rank < (num_kv_heads % mp_size) else 0)
return total_size * my_slices // num_kv_heads
else:
if total_size >= 64:
grain_size = total_size // 64
return (grain_size // mp_size + (1 if rank < (grain_size % mp_size) else 0)) * 64
else:
return total_size // mp_size + (1 if rank < (total_size % mp_size) else 0)
def get_n_embd():
global n_embd
return n_embd
def get_shard_size_list(total_size, mp_size, name=None):
shard_sizes = []
for i in range(mp_size):
shard_sizes.append(get_shard_size(total_size, mp_size, name, i))
return shard_sizes
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