File size: 3,952 Bytes
23bd7af |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 |
# coding=utf-8
# Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from commons import set_random_seed
from commons import IdentityLayer
from commons import print_separator
from commons import initialize_distributed
from mpu.cross_entropy import vocab_parallel_cross_entropy
import mpu
import torch.nn.functional as F
import torch
import random
import sys
sys.path.append("../..")
def torch_cross_entropy(batch_size, seq_length, vocab_size,
logits_scale, seed):
set_random_seed(seed)
identity = IdentityLayer((batch_size, seq_length, vocab_size),
scale=logits_scale).cuda()
logits = identity()
target = torch.cuda.LongTensor(
size=(batch_size, seq_length)).random_(0, vocab_size)
loss = F.cross_entropy(logits.view(-1, logits.size()[-1]),
target.view(-1),
reduction='none').view_as(target).mean()
loss.backward()
return loss, identity.weight.grad
def mpu_cross_entropy(batch_size, seq_length, vocab_size,
logits_scale, seed):
set_random_seed(seed)
identity = IdentityLayer((batch_size, seq_length, vocab_size),
scale=logits_scale).cuda()
logits = identity()
logits_parallel = mpu.scatter_to_tensor_model_parallel_region(logits)
target = torch.cuda.LongTensor(
size=(batch_size, seq_length)).random_(0, vocab_size)
loss = vocab_parallel_cross_entropy(logits_parallel, target).mean()
loss.backward()
return loss, identity.weight.grad
def test_cross_entropy(tensor_model_parallel_size):
if torch.distributed.get_rank() == 0:
print('> testing cross entropy with model parallel size {} ...'.
format(tensor_model_parallel_size))
mpu.initialize_model_parallel(tensor_model_parallel_size)
tensor_model_parallel_size = mpu.get_tensor_model_parallel_world_size()
batch_size = 13
seq_length = 17
vocab_size_per_partition = 11
logits_scale = 1000.0
vocab_size = vocab_size_per_partition * tensor_model_parallel_size
seed = 1234
loss_torch, grad_torch = torch_cross_entropy(batch_size, seq_length,
vocab_size, logits_scale,
seed)
loss_mpu, grad_mpu = mpu_cross_entropy(batch_size, seq_length,
vocab_size, logits_scale,
seed)
error = loss_torch.sub_(loss_mpu).abs().max()
print(' max error in loss on global rank {}: {}'.format(
torch.distributed.get_rank(), error))
assert error < 1.0e-6
error = grad_torch.sub_(grad_mpu).abs().max()
print(' max error in grad on global rank {}: {}'.format(
torch.distributed.get_rank(), error))
assert error < 1.0e-6
# Reset groups
mpu.destroy_tensor_model_parallel()
torch.distributed.barrier()
if torch.distributed.get_rank() == 0:
print('>> passed the test :-)')
if __name__ == '__main__':
initialize_distributed()
world_size = torch.distributed.get_world_size()
tensor_model_parallel_size = 1
while tensor_model_parallel_size <= world_size:
print_separator('test cross entropy')
test_cross_entropy(tensor_model_parallel_size)
tensor_model_parallel_size *= 2
|