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intern-coding-tasks

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# PFN Internship Coding Tasks

This repository contains coding problems used for the screening process in PFN (Preferred Networks) summer internship.

English and Japanese statements are available. The overview of the problems is as follows.

## 2021-2025
The problems in 2021-2025 consist of "coding task" and "thematic task".

## 2020
The problem in 2020 consists of "coding task" and "survey task".

## 2019
The problem set in 2019 consists of six themes. Each applicant needed to choose one of them according to the theme they have chosen.

- Machine Learning
- Back-end
- Front-end
- Chip
- Performance Optimization
- Computer Vision (Chainer)

## 2018
The problem set in 2018 consists of five themes.

- **Machine Learning/Mathematics**: You are asked to implement an algorithm of adversarial examples for some neural network model. You need to write a simple report on the performance of the algorithm as well.
- **Back-end**: You are asked to create a tool that analyzes log files.
- **Front-end**: You are asked to develop a prototype of an annotation tool for speech videos.
- **Processor/Compiler**: You are asked to optimize the code of matrix multiplication. Further, you need to design a hardware circuit of matrix multiplication.
- **Chainer**: You are asked to implement a training code for some model, using Chainer.

## 2017
The problem set in 2017 consists of four themes.

- **Machine Learning/Mathematics**: Reinforcement learning, Cartpole, Cross Entropy Method.
- **Back-end**: Implementation of 'ls' command.
- **Front-end**: Creation of search UI.
- **Chip**: Hardware circuit design.

## Old Problems (2011-2016)
`old` directory contains older problem sets, which were use also in the summer internship screening of PFI (Preferred Infrastructure, Inc.).
Only Japanese statements are available.

* 2016(PFN, PFI): Unsupervised learning. Auto-encoder and its extension.
* 2015(PFN, PFI): Supervised learning. Data preprocessing, perceptron, ZCA Whitening, and its extension.
* 2014(PFI): Template matching.
* 2013(PFI): Search algorithm on random graphs.
* 2012(PFI): String processing. Generalized word chain game.
* 2011(PFI): String processing. Palindrome.

# We Are Hiring!
If you got interested in PFN, we are looking forward to receiving your applications in our internship programs.

We are also hiring full-time employees. Please refer to the job page below.

* [English job page](https://www.preferred.jp/en/careers/)
* [Japanese job page](https://www.preferred.jp/ja/careers/)

### Reference for PFN internship

- 2025 Summer Internship Program
 ([English](https://preferred.jp/en/news/internship2025) /
 [Japanese](https://preferred.jp/ja/news/internship2025))
- 2024 Summer Internship Program
 ([English](https://preferred.jp/en/news/internship2024/) /
 [Japanese](https://preferred.jp/ja/news/internship2024/))
- 2023 Summer Internship Program
 ([English](https://preferred.jp/en/news/internship2023/) /
 [Japanese](https://preferred.jp/ja/news/internship2023/))
- 2022 Summer Internship Program
 ([English](https://preferred.jp/en/news/internship2022/) /
 [Japanese](https://preferred.jp/ja/news/internship2022/))
- 2021 Summer Internship Program
 ([English](https://preferred.jp/en/news/internship2021/) /
 [Japanese](https://preferred.jp/ja/news/internship2021/))

intern-coding-tasks

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