Questions tagged [data-engineering]

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3answers
47 views

Advice on where to continue in the field of data engineering and machine learning

I finished a 28 hours Machine learning with python (Basic course) on Udemy, and it was very beneficial. My aim, is to be able to understand what is ML and how to use its concepts while working with ...
6
votes
2answers
98 views

ETL and Data Engineering is it purely the knowledge of tools or is there theory behind it?

I would like to better understand what a good Data Englineer must know or what he does. Job descriptions mostly list tools that are required, such as Python. If it is possible to separate Data ...
0
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1answer
20 views

The OLAP (On-Line Analytical Processing) cube with 4 dimensions [closed]

A typical OLAP cube looks like this: As I can see, this cube can work with 2 or 3 dimensions, but what if I have 4 dimensions to produce facts? Should I use star schema instead when having more than ...
2
votes
2answers
52 views

Data Engineering Stack - collect, transform and visualize geospatial data

I'm making a side project, where I collect geospatial data by web scrapping and from OSM API. I've started with simple Java application, however, I would like to make it as a data flow, purely for ...
1
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0answers
14 views

Efficient way of adding new columns to datamart without reprocessing complete pipeline

I have a software engineering background and relatively new to data engineering. I am building out tables/datamarts in our datalake for data scientists and analysts to use. We use Airflow for ...
0
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1answer
19 views

Creating more than one worker nodes for local windows machine [closed]

I am using windows laptop. And I installed apache spark for my laptop. And I try to measure spark performance by changing spark components. because of that I want to create more than one worker nodes ...
0
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1answer
24 views

How to run Spark python code in Jupyter Notebook via command prompt

I am trying to import a data frame into spark using Python's pyspark module. For this, I used Jupyter Notebook and executed the code shown in the screenshot below After that I want to run this in CMD ...
0
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1answer
33 views

Can we add other features along with Text in sentiment analysis

Can we add other features along with Text to a ML model . Like giving text and other features as one input combining them and predict the output value. As model can learn some more better if given ...
1
vote
3answers
362 views

Is there a cost associated with converting Koalas dataframe to Spark dataframe?

I know that pandas works "under the hood" with numpy arrays stored in dictionaries. In contrast, Koalas works with the underlying Spark framework. Does that mean that there is no extra cost associated ...
2
votes
1answer
28 views

Loading models from external source

I have a 500MB model which I am commiting to Git. That is a really bad practice since for newer model versions the repository will be huge. As well, It will slow down all builds for deployments. I ...
1
vote
1answer
732 views

how to sort a multi-level pandas data-frame by a particular column?

I want to sort a multi-index pandas dataframe by a column but don't want the entire dataframe to be sorted at once. But rather want to sort by one of the indices. Here is an example of what I mean: ...