Book Image

Distributed Machine Learning with Python

By : Guanhua Wang
Book Image

Distributed Machine Learning with Python

By: Guanhua Wang

Overview of this book

Reducing time cost in machine learning leads to a shorter waiting time for model training and a faster model updating cycle. Distributed machine learning enables machine learning practitioners to shorten model training and inference time by orders of magnitude. With the help of this practical guide, you'll be able to put your Python development knowledge to work to get up and running with the implementation of distributed machine learning, including multi-node machine learning systems, in no time. You'll begin by exploring how distributed systems work in the machine learning area and how distributed machine learning is applied to state-of-the-art deep learning models. As you advance, you'll see how to use distributed systems to enhance machine learning model training and serving speed. You'll also get to grips with applying data parallel and model parallel approaches before optimizing the in-parallel model training and serving pipeline in local clusters or cloud environments. By the end of this book, you'll have gained the knowledge and skills needed to build and deploy an efficient data processing pipeline for machine learning model training and inference in a distributed manner.
Table of Contents (17 chapters)
1
Section 1 – Data Parallelism
6
Section 2 – Model Parallelism
11
Section 3 – Advanced Parallelism Paradigms

Chapter 4: Bottlenecks and Solutions

Using the code we designed in Chapter 3, Building a Data Parallel Training and Serving Pipeline, we can build data parallel training and serving pipelines using either the parameter server or the All-Reduce paradigm. Similar to what we did in Chapter 3, Building a Data Parallel Training and Serving Pipeline, in this chapter, we will focus on the more widely used All-Reduce paradigm.

In this chapter, we will discuss the shortcomings in the current data parallel training and serving pipelines. For practical system bottleneck discussions, we will make the following assumptions:

  • We use homogenous accelerators for all our model training nodes.
  • Compared to CPU memory (that is, main memory), the on-device memory for each accelerator is limited.
  • In multi-GPU, multi-machine cases, the cross-machine network bandwidth is significantly lower than the communication bandwidth among GPUs within a single machine.
  • The training job is exclusively...