multipack_sampler
Multipack distributed sampler for fast padding-free training of LLMs
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The Multipack sampler is a tool designed for padding-free distributed training of large language models. It optimizes batch processing efficiency using an approximate solution to the identical machine scheduling problem. The V2 update further enhances the packing algorithm complexity, achieving better throughput for a large number of nodes. It includes two variants for models with different attention types, aiming to balance sequence lengths and optimize packing efficiency. Users can refer to the provided benchmark for evaluating efficiency, utilization, and L^2 lag. The tool is compatible with PyTorch DataLoader and is released under the MIT license.
README:
The Multipack sampler is designed for padding-free distributed training of large language models. It utilizes an approximate solution to the identical machine scheduling problem to maximize the efficiency of batch processing. On the OpenChat V1 training set, it achieves >99% theoretical efficiency, while the interleaved sampler only achieves ~75%.
Multipack V2 optimized the packing algorithm complexity from O(n k log n)
down to O(n log k log n)
without degrading the packing efficiency, achieving better throughput for a large number of nodes.
The V2 release also has two variants with different packing optimization objective:
-
MultipackDistributedBatchSampler
: Designed for models with quadratic attention. It will try to optimize packing efficiency as well as balance long/short sequences between each nodes, to minimize the difference of quadratic load. -
MultipackDistributedBatchSampler_LinearAttention
: For models with linear attention. Only consider packing efficiency and performs better on it than Quadratic variant, however this algorithm tends to put all long sequences into one node.
Please refer to test_multipack.ipynb
-
Efficiency: Percentage of actual batch size to max batch size
=
number of tokens per batch / max capacity of tokens per batch
-
Utilization: all nodes waiting for the slowest node
=
number of tokens per batch / max number of tokens on a single node * node count
L^2 lag: sqrt(max over node(sum length^2) - min over node(sum length^2))
OpenChat V1 (testdata.json)
Sampler Multipack QuadraticAttention:
Batch count for ranks: [37, 37, 37, 37, 37, 37, 37, 37]
Packing Time: 20ms
L^2 lag avg: 438 max: 717
Efficiency: 98.16%
Utilization: 99.70%
==========
Sampler Multipack LinearAttention:
Batch count for ranks: [36, 36, 36, 36, 36, 36, 36, 36]
Packing Time: 18ms
L^2 lag avg: 6500 max: 6761
Efficiency: 99.64%
Utilization: 99.64%
==========
Sampler Interleaved:
Batch count for ranks: [48, 48, 48, 48, 48, 48, 48, 48]
Packing Time: 0ms
L^2 lag avg: 1914 max: 2000
Efficiency: 75.67%
Utilization: 96.79%
==========
Compatible with PyTorch DataLoader
batch_max_len = 16 * 2048 # batch size * max context length
lengths = np.array([len(tokens) for tokens in data])
sampler = MultipackDistributedBatchSampler(
batch_max_length=batch_max_len,
lengths=lengths,
seed=0
)
dataloader = DataLoader(data, batch_sampler=sampler)
MIT
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