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(kelvin chan) #926

It’s difficult to tell from that if you have overfitted to the validation set or not. It is relative. If you have overfitted to the train set, then the accuracy gap between the train and validation set will be big, which you don’t have, so you are fine with that. But i suspect you overfitted to the validation set (not train), which you will know if the big gap is between that and the test set (which Kaggle is hiding from you and scored you 89%). Again, it is a symptom. Without knowing the detail, it may be other causes.



Did you use the metric that Kaggle evaluates you on (area under the ROC curve) when you submitted your predictions ?

It got me the first time I submitted to Kaggle and I finished among the last ones on the Leader Board haha :rofl:

(Gavin) #928

Oooohhh. I was using error rate, not area under ROC curve. :speak_no_evil:
I’ll see how I can use that metric and try again. Thank you!

(kelvin chan) #929

Thanks to @raimanu-ds to point that out. Didn’t catch my attention that anything medical, it is almost never the accuracy that matter. That definitely will mislead you using wrong metrics.

But it is still good to try some model ensembling after that.

(Stefano) #930

I’ve assumed you’ve used


To display samples. This method shows the transformed/augmented images, not original ones.

(Mohamed Ayman Elshazly) #931

Ok so for lesson 2 I created a web app for the malaria detection dataset on kaggle.
And it achieves 97.2% atm, tho I think fiddling around with LR would yield better results I think. Would love to hear your opinions. PS : I had a hard time deploying the starlette code on pythonanywhere so if anyone has any tips I would really appreciate it, but I used ngrok to make other people try it out.

Here’s the repo link :
The demo link(tho may not be up every time u accessing it sadly) :
Kaggle Dataset link :

(Will Dickerson) #932

Hi all,

I created a handy tool to tell you if you’re bald… or not!

(aradhana) #933

Hi ,

I have tried to create classifier to predict if particular image is of Zeenat Aman or Parveen Babi because since childhood I get confused between these 2 Indian actress.

(aradhana) #934

I know its a very small dataset…One more thing.I did not create separate folder for train and Validation while creating dataset.However during training I gave following command

tfms = get_transforms(do_flip=False)

so does it mean it will pick 0.1 percent of dataset for validation?

(Vineet Tanna) #935

Hi Everyone,

I am a beginner to Deep Learning and recently started the Deep Learning Part 1 MOOC. I have completed the Lesson 1 and as part of my exploration, I took up a dataset to classify the health of a honey bee from Kaggle ( The performance of the model was better than the performance shown in the Kaggle Kernels which was really exciting for me! I have uploaded the notebook to my GitHub

Confusion Matrix

(Dipam) #936

I created an image classifier for pneumonia. The gist for the same is here. Feedback would be highly appreciated.

(kelvin chan) #938

On Catastrophic Forgetting:

I see lot of people have deployed their work as web app. I also remembered in the lesson video, someone asked if it’s possible to collect feedback from user such that the model can improve. Anyone has done this? I recently read this “online” learning, or learning from less common sample, can lead to something called “Catastrophic Forgetting”. Not sure if @jeremy ever discussed in the MOOC.

(Abu Fadl) #939

I tried beam search (in current fastai master, 1.043) on Dave Smith’s Deep Elon (tweets generator) and posted a simple kernel on Kaggle:
It needs some parameter tuning and may work better on guru tweets than Elon’s (Dave’s dataset is on github so was easy to test).


After Lesson 1, I built an old vs new Mini (the classic little British car) classifier. I’m British, and who doesn’t love Minis?
Anyway, I have a background in machine learning, and have built models using Keras and Tensorflow. I was astonished to find that the model built using the techniques from Lession 1 had almost perfect accuracy on the validation set. In fact, when I looked at the confusion matrix, and then at the only two pictures it was misclassifying, I found that it wasn’t getting one of them wrong at all! If you look at the picture (and the positioning of the petrol caps) the two Minis in the picture are in fact one of each: an old and a new!

(David) #941

Hi Gavin,

You wouldn’t be the first one to submit only ones (1) and zeros (0) to this competition. You should submit the probabilities (0.98765 for example). Check if this brings your validation score closer to the Kaggle score, if not already implemented.

I’m struggling myself to improve from approximately 0.975 on Kaggle to anything better. In the validation set I can reach 0.99 accuracy on the full dataset. Maybe I’m overfitting, although my validation loss is still lower than the training loss :roll_eyes:

(Gavin) #942

Thanks @sinsji! I used the predictions instead of the class and got up to 96.18 :slight_smile:

(Amit Kayal) #943

That’s great. I am stuck at 95.25 and my validation set accuracy is way better than this. Looks like i need to generalize my model further


After watching the third lesson I tried to challenge myself and go through a Kaggle challenge on image segmentation, in particular, ship detection from space. I’ve used some best practices for working with large datasets and highly unbalanced data to achieve 0.91+ dice with 256-sized images. Take a look!

Ps. There is also a Docker image which can be deployed for (fun) inference.
The repo is here.

(Jinu Daniel) #945

Created a classifier which will classify popular indian cars. I have used google_images_download which helped me in downloading approximately 100 images per category of images.
More about this project can be found at my github repo.

Please let me know your comments and feedbacks. Thanks to @arunoda for his amazing blog on creating a dataset for cars which helped me a lot in collecting the dataset for this project.


For my own work, I need to work with images of 4 or more channels, not just the standard 3 RBG channels. As far as I know, both @ste and @wdhorton have shared implementations of 4-channel images for the Human Protein Atlas Kaggle competition. However, none of their code works for images of 5 or more channels because they rely on Here, I have implemented a way to use images of any number of channels, as well as custom ways to visualize them.

The notebook doesn’t solve any real problem, it just showcases the implementation. I figured it’d be helpful to other folks that have images of 5+ channels in their own projects.