Lesson 1 - Official topic

jeremy · March 20, 2020, 4:18pm

Sounds like we have a simple misunderstanding. We’re just saying that high school math is the only math prerequisite, and that all other needed math is introduced when required.

This is very different to saying you don’t need math. It’s just saying - you can learn it as you go. You shouldn’t first wait until you’ve studied for years at university before you get started with deep learning.

If we didn’t think math was useful, we wouldn’t have created a length matrix calculus tutorial: https://explained.ai/matrix-calculus/ . Or a computational linear algebra course: https://www.fast.ai/2017/07/17/num-lin-alg/ …

balnazzar · March 20, 2020, 4:25pm

If I am to be honest I was just teasing (or almost, pardon me…) just to obtain a reply like this. And that since I heard a lot of my acquaintances saying that math is more an hindrance than a resource to “do stuff” in AI, and “even Jeremy says that” (of course I’m oversimplifying on purpose).

Now I can point them to your kind reply

Moody · March 20, 2020, 4:28pm

Wow, that will be my honour! Actually, this is my first 3D printing project.

I am planning to convert it to a blog post using fastpage. But, it will possibly take me forever. Due to the current pandemic situation, please help to distribute it.

I contacted the lead STEM teacher of the champion. He may give me some feedback later. Can I update the blog post to refine the procedure in the future? Most importantly, I never write a public post before, can you check whether I get sufficient credits to the ‘Saving the Mask’ champion and Mr WH Lee? Thank you in advance.

jeremy · March 20, 2020, 4:30pm

Yes that’s all fine - thanks Sarada. I’ll put the markdown into a wiki topic here so you can easily edit it as required. (And if you edit it, let me know, so I can update the post).

Moody · March 20, 2020, 4:42pm

Give me another 15 minutes. Let me upload few photos in the doc first.

Moody · March 20, 2020, 5:01pm

Added photos. All yours. Good night (1 am my time)

golz · March 20, 2020, 6:26pm

I’d like to reset my lesson 1 notebook back to original form (I forgot to make a copy) I searched the forum but didn’t see the topic addressed.

golz · March 20, 2020, 6:48pm

I want to upload my own cat photo. When executing the uploader, instead of an upload button I get this error:

AttributeError Traceback (most recent call last)
in
----> 1 uploader = widgets.FileUpload()
2 uploader

AttributeError: module ‘ipywidgets.widgets’ has no attribute ‘FileUpload’

<<<
Anybody know why? (I searched this topic and didn’t see anything)

mcclomitz · March 20, 2020, 7:27pm

Hey Jason - you can reset the whole branch to match master with:

git fetch origin
git reset --hard origin/master

I think this will reset everything though so be careful.

You could also just go to the github page and download the notebook:

github.com

fastai/fastai2/blob/master/nbs/course/lesson1-pets.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Lesson 1 - What's your pet"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Welcome to lesson 1! For those of you who are using a Jupyter Notebook for the first time, you can learn about this useful tool in a tutorial we prepared specially for you; click `File`->`Open` now and click `00_notebook_tutorial.ipynb`. \n",
    "\n",
    "In this lesson we will build our first image classifier from scratch, and see if we can achieve world-class results. Let's dive in!\n",
    "\n",
    "Every notebook starts with the following line; it ensures that any charts or images displayed are shown in this notebook."
   ]
  },

This file has been truncated. show original

sanjeev.b · March 20, 2020, 8:36pm

I use notion too - though for general ToDo lists and notes. Fluid and great to use.

mcclomitz · March 20, 2020, 8:38pm

Is this happening in a normal jupyter notebook running locally? Or are you using collab, paperspace or some other cloud type jazz?

jeremy · March 20, 2020, 8:47pm

@moody post here

golz · March 20, 2020, 9:04pm

I’m on paperspace. thx.

amritv · March 20, 2020, 9:06pm

Amazing work Sarada!

arora_aman · March 20, 2020, 10:05pm

Can you please try to update your ipywidgets.

pip install ipywidgets --upgrade

arora_aman · March 21, 2020, 12:33am

Is anybody else getting blank images below after doing dls.show_batch()? I am simply running Lesson-1 and did a show_batch after creating dls.

mcclomitz · March 21, 2020, 1:03am

What notebook is this in? Have you pulled the latest changes from master?

Albertotono · March 21, 2020, 1:09am

For me it is all ok, Maybe can you try with dls.valid.show_batch(max_n=4, nrows=1)

Albertotono · March 21, 2020, 1:10am

I am importing my own dataset that I saved in that directory in Paperspace any idea how to extract with untar_data it is a .zip file and it should work.

lgvaz · March 21, 2020, 1:39am

I faced the same issue yesterday, only on the PETs dataset