feat: improve gif classification

[yzevm]

Hi @GantMan I working on /~https://github.com/nsfw-filter/nsfw-filter and have some bugs with DOM

Current state

1. nsfwjs.min.js size is 1694185 bytes => ~1.7mb
2. during prediction gif changed size
3. for 10 secs gif it takes 20264ms => ~20 secs

New

1. nsfwjs.min.js size is 2014035 bytes => ~2mb
2. during prediction gif didn't change size
3. for 10 secs gif it takes 15913ms => ~16 secs
4. you can use fps property to adjust amount of frames to predict model.classifyGif(GIF_IMAGE, { topk: 3, fps: 1 })

[yzevm]

UPD1 Oh, I estimate time with prediction of 190 frames for both cases
Found old records, not sure, but looks like its only time for gif preparation (without frames prediction)

libifjs
23.667 -> 31.377
44.173 -> 52.451
01.013 -> 08.798

gif-frames
47.742 -> 48.779
53.875 -> 54.825
58.736 -> 59.696

[GantMan]

This looks great!

Can you please update the README.md to explain the new params along with this change? Then I can merge.

[yzevm]

I just changed a little bit this lib

[yzevm]

no changes(except types), just replace with new @nsfw-filter/save-pixels

[yzevm]

Hi @GantMan, I finished

• works for both environnements: browser and nodejs (without massive packages, but it's pretty slow for all frames on nodejs)
• tests for classifyGif
• updated README docs

ps could you please take a look into classifyGIF implementation, maybe I miss sth (sorry, it's pretty messy)

[GantMan]

FANTASTIC WORK!

Quick note: If I merge this it will break NSFWJS.com for GIFs which is powered by CI to /~https://github.com/infinitered/nsfwjs/tree/master/example/nsfw_demo

I'm OK merging and then tasking myself with updating the code in the demo, but I guess I should ask. Do you want to update the small bit of demo code? That way when I merge this, the new GIF code will go directly to NSFWJS.com?

this means a small update to /~https://github.com/infinitered/nsfwjs/blob/master/example/nsfw_demo/src/App.js#L123-L127

Again, feel free to refuse. NSFWJS.com can be broken for a bit until I find time to update the site to the new syntax API.

[GantMan]

@YegorZaremba - can you contact me and give me your address? We'd love to mail you some swag for your contributions.

My email is Gant followed by the company's domain.