nsfw_data_scraper

by alex000kim

alex000kim / nsfw_data_scraper

Collection of scripts to aggregate image data for the purposes of training an NSFW Image Classifier

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NSFW Data Scraper

Note: use with caution - the dataset is noisy

Description

This is a set of scripts that allows for an automatic collection of tens of thousands of images for the following (loosely defined) categories to be later used for training an image classifier: -

porn
- pornography images -
hentai
- hentai images, but also includes pornographic drawings -
sexy
- sexually explicit images, but not pornography. Think nude photos, playboy, bikini, etc. -
neutral
- safe for work neutral images of everyday things and people -
drawings
- safe for work drawings (including anime)

Here is what each script (located under

scripts
directory) does: -
1_get_urls_.sh
- iterates through text files under
scripts/source_urls
downloading URLs of images for each of the 5 categories above. The Ripme application performs all the heavy lifting. The source URLs are mostly links to various subreddits, but could be any website that Ripme supports. Note: I already ran this script for you, and its outputs are located in
raw_data
directory. No need to rerun unless you edit files under
scripts/source_urls
. -
2_download_from_urls_.sh
- downloads actual images for urls found in text files in
raw_data
directory. -
3_optional_download_drawings_.sh
- (optional) script that downloads SFW anime images from the Danbooru2018 database. -
4_optional_download_neutral_.sh
- (optional) script that downloads SFW neutral images from the Caltech256 dataset -
5_create_train_.sh
- creates
data/train
directory and copy all
*.jpg
and
*.jpeg
files into it from
raw_data
. Also removes corrupted images. -
6_create_test_.sh
- creates
data/test
directory and moves
N=2000
random files for each class from
data/train
to
data/test
(change this number inside the script if you need a different train/test split). Alternatively, you can run it multiple times, each time it will move
N
images for each class from
data/train
to
data/test
.

Prerequisites

  • Docker

How to collect data

$ docker build . -t docker_nsfw_data_scraper
Sending build context to Docker daemon  426.3MB
Step 1/3 : FROM ubuntu:18.04
 ---> 775349758637
Step 2/3 : RUN apt update  && apt upgrade -y  && apt install wget rsync imagemagick default-jre -y
 ---> Using cache
 ---> b2129908e7e2
Step 3/3 : ENTRYPOINT ["/bin/bash"]
 ---> Using cache
 ---> d32c5ae5235b
Successfully built d32c5ae5235b
Successfully tagged docker_nsfw_data_scraper:latest
$ # Next command might run for several hours. It is recommended to leave it overnight
$ docker run -v $(pwd):/root/nsfw_data_scraper docker_nsfw_data_scraper scripts/runall.sh
Getting images for class: neutral
...
...
$ ls data
test  train
$ ls data/train/
drawings  hentai  neutral  porn  sexy
$ ls data/test/
drawings  hentai  neutral  porn  sexy

How to train a CNN model

  • Install fastai:
    conda install -c pytorch -c fastai fastai
  • Run
    train_model.ipynb
    top to bottom

Results

I was able to train a CNN classifier to 91% accuracy with the following confusion matrix:

alt text

As expected,

drawings
and
hentai
are confused with each other more frequently than with other classes.

Same with

porn
and
sexy
categories.

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