# Tag Info

12

By using the functional API you can easily share weights between different parts of your network. In your case we have an Input $x$ which is our input, then we will have a Dense layer called shared. Then we will have three different Dense layers called sub1, sub2 and sub3 and then three output layers called out1, out2 and out3. x = Input(shape=(n, )) shared ...

4

Since we are talking about multiple different types of targets (classes versus numerical for example) we already need a composite loss function. I will consider how to balance the different composite parts of the loss function outside of the scope of this answer but if you look into multi-task learning there are solutions to this. What you could do (both in ...

4

You have one classification task and one regression task, but sklearn's multioutput meta-estimators only support two tasks of the same type. The best solution here is to train two models: A binary classifier to predict $target1$ A regressor to predict $target2$ For example: from sklearn.cross_validation import train_test_split from sklearn.ensemble ...

3

You should design a multi-task model (MTM). MTM has the ability to share learned representations from input between several tasks. More precisely, we try to simultaneously optimize a model with m types of loss function, one for each task. Consequently, MTM will learn more generic features, which should be used for several tasks, at its earlier layers. Then, ...

2

You should break this down into two models. I would solve this in the following manner: The first model would predict if its either Target 1 or Target 2 by looking at 100 columns The second model then would look at the 100 columns and additionally the output of model 1 and then predict 0 or 1 in case of target 1 or 0-100 in case of target 2. I do not ...

1

After playing around with tf.data.map operations I found the answer was easier than expected, I simply had to preprocess the data and put all the labels for each output of the model as a different key of a dictionary. First I create a dataset from the tfrecords file dataset = tf.data.TFRecordDataset(tfrecords_file) Next, I parse data from the file ...

1

Following your considerations: IMDB and RT don't have all the same movies I would build a larger dataset of movies, aggregate all observations available, and run a model on that. There are words local to each dataset. i.e. the word "rotten" might be a frequent word on RT, but never appears in the IMDB dataset. I think this doesn't constitute a ...

1

You need to pass an array object. You don't need to map the label array with the output node name ( like TensorFlow low-level APIs ). Pass the list containing the label arrays directly. model.fit(X_train, [ label1, label2 ] ,batch_size=10,verbose=1 ,callbacks=[checkpoint],validation_data=(X_test,y_test),epochs=40)

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Check this. Under the heading Multi-tasks losses they have mentioned how they average losses from two different tasks. They do a weighted average depending on their use case.

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Adjust the optimizer hyper-parameters 1) use amsgrad = True 2) try lower beta_1 3) adjust lr from 1e-6 to .1 or use a learning rate finder 4) use either the weight_decay(learning schedule) in the optimizer or add a Callback that will adjust the learning rate while training adjust the parameters here..... optimizer=Adam(lr=0.0001, beta_1=0.9, beta_2=0.999, ...

1

So, it turns out that my problem had a lot more to do with network structure than anything else. I was trying to share too many lower levels, and then still not leaving enough room for the later branches to learn individual features/locations. In the end, I re-structured my network so that there was only 1-2 shared convolutional layers, then each primary ...

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MTL is supposed to enable your shared layer to generalise better.For eg. in a text classification problem your encoder would be trained on separate tasks: one could be multi class classification(original task) itself and let's take identifying the sentiment of the sentence(again a classification task; but different than the original task) as the other task. ...

1

You have already found the answer by yourself: if there are missing values, you should not backpropagate on them. I do not know of any particular name for this action. I do not think that there are already implemented functions to do so, but it seems quite straightforward to embed your loss function (e.g. mean squared error) into a personalized one. For ...

1

Every Blob in caffe can be assigned a nonzero loss weight. And you can have an arbitrary number of outputs. This means you can just learn n different networks on the same data with different targets and assign every loss function it's own weight. Caffe takes care of adding up all the loss.

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