EPLB
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EPLB
Overview :
Expert Parallelism Load Balancer (EPLB) is a load balancing algorithm for Expert Parallelism (EP) in deep learning. It ensures load balance across different GPUs through a redundant expert strategy and a heuristic packing algorithm, while utilizing group-constrained expert routing to reduce inter-node data traffic. This algorithm is significant for large-scale distributed training, improving resource utilization and training efficiency.
Target Users :
This product is designed for deep learning researchers and engineers who need to conduct large-scale distributed training, especially those using Expert Parallelism (EP) techniques. It helps optimize resource allocation, improve training efficiency, and reduce hardware costs.
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Use Cases
In natural language processing (NLP) tasks, using EPLB to optimize the expert parallel training of Transformer models significantly improves training speed.
In computer vision tasks, EPLB achieves expert load balancing in multi-GPU environments, enhancing model performance.
In large-scale recommendation systems, EPLB optimizes the expert parallel training process, reducing training time and resource consumption.
Features
Supports both hierarchical and global load balancing strategies to adapt to training needs at different stages.
Dynamically replicates experts with heavier loads through a redundant expert strategy to ensure load balance.
Utilizes group-constrained expert routing to place experts from the same group on the same node whenever possible, reducing cross-node communication.
Provides expert replication and placement plans based on estimated expert load, supporting custom load prediction methods.
Open-source implementation, facilitating easy integration and extension in different frameworks.
How to Use
1. Clone the EPLB repository to your local machine.
2. Install dependent libraries, such as PyTorch.
3. Prepare expert load data, for example, by calculating historical statistical loads.
4. Call the `eplb.rebalance_experts` function, passing in the load data and relevant parameters (such as the number of replicas, nodes, and GPUs).
5. Configure the model training environment based on the output expert replication and placement plan.
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