Tweet

Zach Mueller

8 Apr, 13 tweets, 8 min read

@fastdotai

A list of the best (and partially biased) @fastdotai resources, in no particular order, with descriptions and how I utilize them 🙂

(A thread)

docs.fast.ai paired with their source notebooks in github.com/fastai/fastai/….

Looking from documentation to examples right away, and letting yourself get your hands dirty. The most common notebooks I go back to ...

@fastdotai

nb50, DataBlock: docs.fast.ai/tutorial.datab…

Shows a variety of ways to create @fastdotai DataBlock and DataLoaders with the midlevel API

Callback (Core): docs.fast.ai/callback.core.…

Remembering the event trigger names, how they work, and quick links to other examples

...

@fastdotai

And Learner, as that's the basics of everything @fastdotai trains with:

docs.fast.ai/learner.html

@GuggerSylvain

From a course-forward approach we have the most recent course live at course.fast.ai, and @GuggerSylvain & @jeremyphoward amazing book available at book.fast.ai as well as for free on Github: github.com/fastai/fastbook

We can't forget the forums! Easily my one-stop-shop if I ever have a question about *anything* in fastai. Even if it's just for a casual stroll through the forums, there is something available in there for everyone to learn with a welcoming community!
forums.fast.ai

Then of course #nbdev: nbdev.fast.ai

Coupled with #fastcore: fastcore.fast.ai

Trailing back and forth between the two as I look into and use nbdev let's me quickly see how fastai's (suite) "magic" functions work, and let's me learn how to utilize them more
...

@amaarora

Then we have @amaarora's timmdocs, an additional documentation to @wightmanr's timm library that he's been doing an *excellent* job on:

fastai.github.io/timmdocs/

@fastdotai

Now onto the bias, we have my walkwithfastai (walkwithfastai.com) which consists of numerous other tutorials and different DataBlock methods that aren't shown in the fastai documentation, and also contains my API-forward approach towards teaching @fastdotai
...

Additional mentions:

The fastdot library (fastdot.fast.ai) is what I do 99% of my model visualizations when writing presentations for work or conferences

The fastrelease library (fastrelease.fast.ai) streamlining pip and conda releases as well as release notes

fastpages (fastpages.fast.ai), easily the *quickest* and easiest way to get your own blog up and running, utilizing either a simple word document, Markdown, or my favorite: Jupyter Notebooks. My own blog with it is at muellerzr.github.io/fastblog

@fastdotai

And most importantly (for me), looking into @fastdotai's Github actions workflows (github.com/fastai/fastai/…)

These have helped me a great deal in understanding the power GH actions can provide, and how to utilize it

@fastdotai

Hopefully this provides some educational resources for folks wanting to learn @fastdotai

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More from @TheZachMueller

Zach Mueller

@TheZachMueller

7 Apr

@fastdotai

Quiz Time!

Can anyone tell me the difference between this @fastdotai code? How does it behave differently:

Answer: There isn't!

One is more "verbose" in my opinion (get_x and get_y), but neither lose any flexibility as you use it.

2/

But what if I have three "blocks"? Don't I need to use `getters` for that?

Not necessarily. Since we can declare an `n_inp` (as seen below), we can simply load in our `get_x` or `get_y` with multiple functions to be utilized instead for those types:

Read 5 tweets

Zach Mueller

@TheZachMueller

6 Apr

@fastdotai

lib2nbdev has been on my mind for months now, and finally it exists! What's the biggest struggle with @fastdotai's #nbdev? Using it on existing projects. This tool aims to fix that.

But how does it work?

novetta.github.io/lib2nbdev/

https://twitter.com/Novettasol/status/1379508120028856322

With a simple bash command: `convert_lib`.

You are then guided through the process of setting up nbdev's `setting.ini` file and afterwards all of your existing code will be converted directly into fully functional notebooks!

But wait, don't you just throw it all into one big cell?

NO! Instead lib2nbdev will determine what should be private or public, what's an import, and what particular cell tag it should be generated with, such as below which has both private and public tags:

Read 8 tweets

Zach Mueller

@TheZachMueller

27 Feb

Thanks everyone for joining me on this much more brief stream, in this thread I'll try and summarize all we discussed including:

- x is not implemented for y
- LossMetrics
- TensorBase and tensor metadata

And here is the stream:

1/

@fastdotai

.@fastdotai had utilized their own tensor subclassing system in v2, however originally there weren't many issues as fastai just "let" you do things with these classes. Then @PyTorch came along and introduced them in 1.7. Suddenly, people were getting this! Why?

@fastdotai

Pytorch became much more explicit in what subclasses can interact with oneanother. As a result @fastdotai had to make the TensorBase class which allows for any tensor-types to interact with each other. A quick function to convert and an example are below 3/

Read 11 tweets

Zach Mueller

@TheZachMueller

20 Feb

Thank you all SO much for joining me tonight, it was a ton of fun to be back in the streaming/teaching wheelhouse again! We had almost 300 people chime in! For those that missed out, the video link is here:
1/

The notebooks are also available here, and eventually I'll have them fully integrated into walkwithfastai.com, just need to figure out a good way first! 2/ github.com/walkwithfastai…

@fastdotai

From what I gathered from the feedback, it seems this stream really did help open up everyone's eyes to the power of @fastdotai's Callback system, and how it's training loop works. It's not just a marketing phrase when they say you can modify ~everything~ in the training loop! 3/

Read 5 tweets

Zach Mueller

@TheZachMueller

18 Feb

@fastdotai

Have you wanted to know just what goes on in @fastdotai's training loop and just what those pesky Callbacks are up to? In the latest release of Walk with @fastdotai this is now possible!

walkwithfastai.com/basics.trainin…

1/

What we've done here is extended fastai's existing `show_training_loop` functionality to include some information (from a provided doc string) of what exactly is occurring during each event. This then lets you get more familiar with what fastai's training loop, ... 2/

Understand when things are called, and what happens at each step. The old version (which is still there if you pass `verbose=False`) simply just showed what Callbacks were triggered (pictured below)

Read 5 tweets

Zach Mueller

@TheZachMueller

14 Feb

@PyTorch

🎉🎉New Blog Alert!🎉🎉

Come learn how to integrate your @PyTorch into @fastdotai with the most minimal fastai possible!

What does this entail?

- Pytorch Datasets
- Pytorch DataLoaders
- Pytorch Models

But, is it really so easy as advertized?

muellerzr.github.io/fastblog/2021/…

@fastdotai

Let's find out. In total, this article used four @fastdotai imports to have full access to the training loop and pretty fit outputs:

Optimizer, DataLoaders, Learner, and ProgressCallback

From there, it's really just as simple as passing it all to `Learner` and having it go from there!

Read 8 tweets

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