Can't train a model using the IMDB-WIKI dataset-possible due to corrupted .mat file

[galoiscch]

When I tried to run "create_db.py", after the progress bar reached 100%, my computer was frozen. After a while, the command line output a word "killed". Since a file called imdb_db.mat was found in the directory "data",I tried to continue the training process, but the error "IOError: could not read bytes" appeared.

I checked the "imdb.mat" in the directory "imdb_crop" with Octave(I don't have MATLAB), I found that I can't be loaded into Octave. The error "warning: load: can not read non-ASCII portions of UTF characters; replacing unreadable characters with'?'" appeared when I tried to load the "imdb.mat". I did the same to "imdb_db.mat",the error " error: load: reading matrix data for 'image' error: load: trouble reading binary file '/home/mt/Downloads/age-gender-estimation-master/data/imdb_db.mat'" appeared. Only gender,img_size,min_score was loaded.

Is the file "imdb.mat" corrupted? Or I used the file wrongly? I am looking forward to your reply. Your help will be greatly appreciated.

[galoiscch]

Or can you give me the format of your label so that I can make my own dataset? Thanks a lot

[yu4u]

How was the file size of "imdb.mat"? It should be larger than 2GB (2114467536). Could you try smaller dataset "wiki": python3 create_db.py --output data/wiki_db.mat --db wiki --img_size 64.

[yu4u]

The details of the labels can be found in the project page of the original work. I simply made the function to load the meta file and you can use it independently from create_db.py as:

from utils import get_meta
full_path, dob, gender, photo_taken, face_score, second_face_score, age = get_meta(mat_path, db)

Please refer to utils.py for implementation: https://github.com/yu4u/age-gender-estimation/blob/master/utils.py

[galoiscch]

The size of "imdb.mat " is just 22.9MB.

[galoiscch]

By the way, how large is the dataset you used for training the pre-trained model that you gave to us? Thanks.

[yu4u]

I used 90% of the IMDB dataset for training and the remaining for validation.

[galoiscch]

I started the training on wiki dataset yesterday. However, the loss became nan in the fourth epoch. I tried to use weight files it generated, but the age estimation of all people are 28,M.

[yu4u]

How about decreasing learning rate? Currently, we should change the source code because no option is provided for the modification of learning rate...

class Schedule:
    def __init__(self, nb_epochs):
        self.epochs = nb_epochs

    def __call__(self, epoch_idx):
        if epoch_idx < self.epochs * 0.25:
            return 0.1
        elif epoch_idx < self.epochs * 0.5:
            return 0.02
        elif epoch_idx < self.epochs * 0.75:
            return 0.004
        return 0.0008

[galoiscch]

Thank, I will try it tomorrow. However, I think it may not due to high learning rate, because the drop of loss was not gradual. The loss was about 19 just before the loss dropped to nan.

[galoiscch]

3264/34324 [=>............................] - ETA: 18302s - loss: 19.6312 - dense_1_loss: 4.1135 - dense_2_loss: 15.5105 - dense_1_ac 
3296/34324 [=>............................] - ETA: 18284s - loss: nan - dense_1_loss: nan - dense_2_loss: nan - dense_1_acc: 0.7403 -

The loss suddenly dropped

[yu4u]

In my environment, loss did not become nan. I used default parameters except the image size --img_size 64.

Epoch 3/30
34304/34324 [============================>.] - ETA: 0s - loss: 19.6199 - dense_1_loss: 4.0342 - dense_2_loss: 15.5571 - dense_1_acc: 0.7497 - dense_2_acc: 0.0348Epoch 00002: val_loss improved from 19.65336 to 19.59147, saving model to checkpoints/weights.02-19.59.hdf5
34324/34324 [==============================] - 338s - loss: 19.6203 - dense_1_loss: 4.0342 - dense_2_loss: 15.5574 - dense_1_acc: 0.7497 - dense_2_acc: 0.0348 - val_loss: 19.5915 - val_dense_1_loss: 3.9978 - val_dense_2_loss: 15.5856 - val_dense_1_acc: 0.7520 - val_dense_2_acc: 0.0330
Epoch 4/30
34304/34324 [============================>.] - ETA: 0s - loss: 37.1522 - dense_1_loss: 2.0977 - dense_2_loss: 8.3536 - dense_1_acc: 0.6014 - dense_2_acc: 0.0245Epoch 00003: val_loss did not improve
34324/34324 [==============================] - 338s - loss: 37.1437 - dense_1_loss: 2.0968 - dense_2_loss: 8.3512 - dense_1_acc: 0.6015 - dense_2_acc: 0.0246 - val_loss: 22.4076 - val_dense_1_loss: 0.5602 - val_dense_2_loss: 4.0711 - val_dense_1_acc: 0.7520 - val_dense_2_acc: 0.0393
Epoch 5/30
34304/34324 [============================>.] - ETA: 0s - loss: 11.9625 - dense_1_loss: 0.5696 - dense_2_loss: 4.0888 - dense_1_acc: 0.7494 - dense_2_acc: 0.0376Epoch 00004: val_loss improved from 19.59147 to 6.70381, saving model to checkpoints/weights.04-6.70.hdf5
34324/34324 [==============================] - 338s - loss: 11.9594 - dense_1_loss: 0.5695 - dense_2_loss: 4.0888 - dense_1_acc: 0.7495 - dense_2_acc: 0.0376 - val_loss: 6.7038 - val_dense_1_loss: 0.5629 - val_dense_2_loss: 4.0659 - val_dense_1_acc: 0.7520 - val_dense_2_acc: 0.0443
Epoch 6/30
 9568/34324 [=======>......................] - ETA: 233s - loss: 6.2101 - dense_1_loss: 0.5671 - dense_2_loss: 4.0743 - dense_1_acc: 0.7491 - dense_2_acc: 0.0397

[galoiscch]

I think it is something which only happens in training with CPU.

[galoiscch]

What will happen if the training set is too small? I just train the program with 139 images and the estimation of all person is 30 years-old and female. P.S I am now making a dataset which consists of Asian faces only. Wish me good luck.

[marlesson]

@galoiscch if the dataset is too small, it will not be representative enough for "population". That is, the model is not generalizable. DeepLearning needs a LOT of data for training.

[nyck33]

I had the same problem with the imdb_db.mat being only 200B in size but the create_db.py ended with a memory error.

[yu4u]

@nyck33 The implementation is really bad... I fixed the problem a little bit. Please checkout the latest code and try it. It works with the half memory size.

[nyck33]

Hi Yu4u-san,

I tried but ended up with a Memory Error. I tried the compress=True option with the old code (still Memory Errors) so will do so with the updated one. However, I trained UTKFace with depth 10, width 4 for almost 90 percent accuracy on gender in 29 epochs so can send you the weights file if you think it's beneficial. Thanks for all your help.

---

From: Yusuke Uchida notifications@github.com Sent: Wednesday, September 11, 2019 12:31 PM To: yu4u/age-gender-estimation age-gender-estimation@noreply.github.com Cc: Toyoda Kim, Nobutaka T nobutaka@gatech.edu; Mention mention@noreply.github.com Subject: Re: [yu4u/age-gender-estimation] Can't train a model using the IMDB-WIKI dataset-possible due to corrupted .mat file (#6)

@nyck33https://github.com/nyck33 The implementation is really bad... I fixed the problem a little bit. Please checkout the latest code and try it. It works with the half memory size.

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[sebastiaopamplona]

The size of "imdb.mat " is just 22.9MB.

Hello @galoiscch, the size of my imdb.mat is also 22.9mb... Have you found the original imdb.mat file?