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Data Science : Recent Questions and Answers (Page 6)

Find answers to your questions about Data Science or help others by answering their Data Science questions.

How to deal with mixed type features?

I'm working on a dataset with more than 2000 features. Most of the features contain both numerical values and categorical features. For example, in the feature represents how long has...

Asked on 12/19/2021

2 answer

How is this score function estimator derived?

In this paper they have this equation, where they use the score function estimator, to estimate the gradient of an expectation. How did they derive this?...

Asked on 12/19/2021

1 answer

How to grid search feature selection and neural network hyperparameters in the same grid?

I'm using the GridSearchCV () class from scikit to perform hyperparameter optimization in a sequential neural network. I've built a pipeline to also find the best number of features by...

Asked on 12/19/2021

1 answer

How can I easily retrieve the latent space encodings in tensorflow?

Here is where I'm at. I built and trained an autoencoder in tensorflow. The model summary looks like so:Model: "model_3"_________________________________________________________________Layer (type) ...

Asked on 12/19/2021

1 answer

PySpark: How do I specify dropna axis in PySpark transformation?

I would like to drop columns that contain all null values using dropna(). With Pandas you can do this with setting the keyword argument axis = 'columns' in dropna(). ...

Asked on 12/16/2021

2 answer

What is the best way to encode an arbitrary collection of strings into int categorical variables?

I have a bunch of categorical labels which I want to transform into int categorical features for an ML algorithm.The problem is I don't have a prior list of...

Asked on 12/16/2021

1 answer

Adding and multiplying higher values based on different columns of a dataframe

I am trying to calculate scores based on different values in the dataframe. Since these scores are based on different conditions, I am having problems where in the final calculation,...

Asked on 12/16/2021

1 answer

Training a CNN on a large dataset

I am currently trying to build a CNN for around 100,000 images. There are 42 classes. I have used the default batch size of 32. This is how my model...

Asked on 12/16/2021

2 answer

When does Adam update its weights?

I have a dataset with at least 70% of labels incorrect. I'd expect that incorrect labels would compensate each other while true labels will be taught properly (given a very...

Asked on 12/16/2021

1 answer

Multi-class neural net always predicting 1 class after optimization

During training, the neural net settles into a place where it always predicts 1 of the 5 classes. My train and test sets are distributed as such:Train SetSamples: 269,501....

Asked on 12/14/2021

3 answer

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