# A new approach to forecast service parts demand by integrating user preferences into multi-objective optimization

## TL;DR

This paper introduces a neural network-based framework that integrates user preferences into a multi-objective optimization model to improve service parts demand forecasting, balancing accuracy and service level.

## Contribution

It proposes a novel framework using multi-gradient descent for preference-based multi-objective optimization with neural networks, specifically for service parts demand forecasting.

## Key findings

- Outperforms baseline methods on Lenovo data
- Effectively balances forecast accuracy and service level
- Uses Encoder-Decoder LSTM for demand prediction

## Abstract

Service supply chain management is to prepare spare parts for failed products under warranty. Their goal is to reach agreed service level at the minimum cost. We convert this business problem into a preference based multi-objective optimization problem, where two quality criteria must be simultaneously optimized. One criterion is accuracy of demand forecast and the other is service level. Here we propose a general framework supporting solving preference-based multi-objective optimization problems (MOPs) by multi-gradient descent algorithm (MGDA), which is well suited for training deep neural network. The proposed framework treats agreed service level as a constrained criterion that must be met and generate a Pareto-optimal solution with highest forecasting accuracy. The neural networks used here are two Encoder-Decoder LSTM modes: one is used for pre-training phase to learn distributed representation of former generations' service parts consumption data, and the other is used for supervised learning phase to generate forecast quantities of current generations' service parts. Evaluated under the service parts consumption data in Lenovo Group Ltd, the proposed method clearly outperform baseline methods.

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Source: https://tomesphere.com/paper/1906.06816