Questions tagged [apache-spark]

Apache Spark is an open source cluster computing system that aims to make data analytics fast — both fast to run and fast to write, originally developed in the AMPLab at UC Berkeley.

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Any Interface/Library that can take the Python ML code and run on spark cluster without learning PySpark?

I have been working with Python for machine learning and have a fair amount of code written in Python using libraries such as scikit-learn, pandas, and numpy. Recently, I’ve been faced with larger ...
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Databricks Extracting features out of Big Files like Step and PDF

So i dont know if this is the right community to ask this question, but lets see. So we are using databricks in our company and we extract Features out of big binary files like PDF and STEP. We trying ...
muhmuhhum's user avatar
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understanding how apache spark functionality overlaps with other popular sql query engine and big data frameworks

i m really interested in seeing how functionality of diff big data tools overlaps between apache spark, apache drill, cloudera impala, trino, presto db. i m confused about the difference btw"...
wando's user avatar
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Hadoop, Spark and Cloud

It seems Hadoop, Spark, and different versions of Clouds offer facilities to store and analyze big data. There are some articles comparing Hadoop and Spark (for example, this article). There are also ...
Tara's user avatar
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IllegalArgumentException at org.apache.xbean.asm5.ClassReader.<init>(Unknown Source) when training an ALS implementation of spark in scala

I was following this tutorial trying to write a collaborative recommender system using the alternating least squares algorithm in spark. I am using the movie lens dataset which can be found here. My ...
ptushev's user avatar
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Can someone suggest good books or resources on SparkR?

I'm trying to find a resource on SparkR specifically so that I can learn about the subtleties in it. But there doesn't seem to be much, other than the docmentation. I found a book called Mastering ...
iYOA's user avatar
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Not able to read data from Mongodb for below schema [closed]

Am trying to read very complex json from mongoDB. Tried in multiple ways nut no luck. Sample schema below : ...
sai's user avatar
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What is the difference between Data Modeling and Data Processing?

When discussing big data, it is sometimes mentioned that data modeling can be done by using a tool like map reduce, while data processing may be performed by apache spark. What is the difference ...
Karl 17302's user avatar
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Working with massive data what is the right approach

let's say I have database with massive data (millions of rows) additionally Let's say 26 Million rows are entered every day I want to build a fraud model to check these 26 Million rows every day.. as ...
MAS's user avatar
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Group a spark dataframe by a starting event to an ending event

Given a series of events (with datetime) such as: failed, failed, passed, failed, passed, passed I want to retrieve the time from when it first "failed" to when it first "passed," ...
Ronen's user avatar
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Storage of N-dimensional matrices (tensors) as part of machine learning pipelines

I'm an infra person working on a storage product. I've been googling quite a bit to find an answer to the following question but unable to do so. Hence, I am attemping to ask the question here. I am ...
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Generalized Additive Modeling Apache Spark implementation

Does Spark MLlib support Generalized Additive Modeling? How does one go about implementing GAM models in Spark? I want to implement GAM (Generalized additive model) model in Spark. Based on my ...
Pavan's user avatar
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CREATE TABLE USING Oracle DATA_SOURCE

I am trying to create a table using ORACLE as a data source using spark query but getting an error. %sql CREATE TABLE TEST USING org.apache.spark.sql.jdbc OPTIONS ( url "jdbc:oracle:thin:@...
nikhil parmar's user avatar
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275 views

Creating table in Databricks using the table from Oracle

I am trying to create a table in Databricks using a object in Oracle Db, but getting an error ...
nikhil parmar's user avatar
1 vote
1 answer
282 views

Outlier Elimination in Spark With InterQuartileRange Results in Error

I have the following function that is supposed to calculate the outlier for a given dataset. ...
joesan's user avatar
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Would it be possible/practical to build a distributed deep learning engine by tapping into ordinary PCs' unused resources?

I started thinking about this in the context of Apple's new line of desktop CPUs with dedicated neural engines. From what I hear, these chips are quite adept at solving deep learning problems (as the ...
AffableAmbler's user avatar
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How to make model not too dependent on one variable?

Let's suppose I have a generic model: Variable A | Variable B | Variable C | Variable D Variable Dis a categorical variable. ( ...
Aron Latis's user avatar
2 votes
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388 views

Hashing trick for dimensionality reduction

I am building a model that uses TF-IDF NLP features in Spark Mllib. The TF-IDF HashingTF function in Mllib uses the 'hashing trick' to efficiently allocate terms to features. My question is: does the ...
John's user avatar
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spark ml StringIndexer vs OneHotEncoder, when to use which?

Confused as to when to use StringIndexer vs StringIndexer+OneHotEncoder. The OneHotEncoder docs say For string type input data, it is common to encode categorical features using StringIndexer first. ...
lampShadesDrifter's user avatar
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Why do I need to create a dataframe just to add a column? [closed]

So I worked with a bit of pandas and in that, it's easy to add a column to an existing dataframe. But in spark, a new dataframe needs to be created using 'withColumn'. I'm a complete newbie so is ...
MashedPotoatoes's user avatar
1 vote
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How to understand Xgboost model dump

Noticed that spark xgboost does not have a API trees_to_dataframe() as that in Python API, I am trying to parse the getModelDump ...
helloworld's user avatar
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1 answer
285 views

anyone Explain why Spark is considered “in-memory” compared to Hadoop [closed]

I don't need different between Explain why Spark is considered “in-memory” compared to Hadoop.
Enish Shah's user avatar
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how to calculate the cosine similarity between two files?

I am using spark and scala to implement an issue. files contain phrases or sentences. I want to use domain based method to calculate the cosine similarity between tags.I convert two files into a ...
salm's user avatar
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1 vote
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Distributed Tensorflow VS Tensorflow on Spark

I am new to Deep Learning and Tensorflow. I learned TensorFlow can be code to run in stand-alone mode and in distributed mode. I also came across Tensorflow on Spark framework that will allow the ...
Raj's user avatar
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Clustering large set of images

I've got some big datasets of images (a few million each), and I would like to cluster them according to images' visual similarities. I've extracted a feature vector for each image; the space of ...
Overloop's user avatar
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1 answer
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Tools for a data science job [closed]

Could someone list out all the important tools and software required for a data science job? Example spark, tensorflow, SQL, tableau etc. It would be helpful if you could list the domain and then 2 ...
Academic's user avatar
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4 votes
1 answer
841 views

What is the main difference between Hadoop and Spark? [closed]

I recently read the following about Hadoop vs. Spark: Insist upon in-memory columnar data querying. This was the killer-feature that let Apache Spark run in seconds the queries that would take Hadoop ...
Ironclad's user avatar
4 votes
1 answer
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Has anyone succeeded in finding a good Scala/Spark kernel for Jupyter?

The ones I've tried so far Almond: Works very well for just Scala, but you have to import dependencies, and it gets tedious after a while. And unfortunately can't run when using Spark with YARN ...
Varun Gawande's user avatar
2 votes
1 answer
255 views

Spark: How to run PCA parallelized? Only one thread used

I use pySpark and set my configuration like following: ...
bonfab's user avatar
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User defined aggregations on data of around 200GB where row order matters

I am working with "medium large" data of around 200GB. The data are long form log files, where there are several thousand logs for each "entity". The entities are actually flights ...
Placidia's user avatar
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What is important for Pharmaceutical companies to answer with Big Data Analysis?

I am a data scientist, and I have some biological background (genetics). I have been asked to give a talk for our customers from pharmaceutical industry. I should show them how they benefit from Big ...
Rebecca's user avatar
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multi-label prediction with pySpark

I am new to Spark I am using pyspark to predict a multi label results. I have converted multi labels to binary So my labels will look like this ...
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3 answers
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PicklingError in pyspark (PicklingError: Can't pickle <class '__main__.Person'>: attribute lookup Person on __main__ failed)

I am unable to pickle the below class. I am using data bricks 6.5 ML (includes Apache Spark 2.4.5, Scala 2.11) ...
kamal kumawat's user avatar
1 vote
0 answers
69 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 ...
Abdul R's user avatar
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1 answer
74 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 ...
randunu galhena's user avatar
4 votes
3 answers
12k views

Remove all columns where the entire column is null

I have a very dirty csv where there are several columns with only null values. I would like to remove them. I am trying to select all columns where the count of null values in the column is not equal ...
CJL's user avatar
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0 votes
1 answer
436 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 ...
randunu galhena's user avatar
1 vote
0 answers
1k views

cannot access hive from spark [closed]

I am trying to install a hadoop + spark + hive cluster. I am using hadoop 3.1.2, spark 2.4.5 (scala 2.11 prebuilt with user-provided hadoop) and hive 2.3.3 (also tried 3.1.2 with the exact same ...
user3044083's user avatar
0 votes
1 answer
709 views

Spark/Databricks: GPU does not appear to be utilized for ML regression (cross-validation, prediction) notebook

I have created and attached a notebook to a GPU-enabled Databricks cluster (6.4 ML (includes Apache Spark 2.4.5, GPU, Scala 2.11), EC2 type: p2.xlarge). I have started running the notebook that ...
James Adams's user avatar
1 vote
0 answers
16 views

how to configure and access data on spark

friend this week i am very busy on installation and configuration of spark envirnoment i did the installation and I begin basic operations like creating folder and adding text file to the folder,...
haftuk's user avatar
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1 vote
1 answer
274 views

Pyspark Dataframes to Pandas and ML Ops - Parallel Execution Hold?

If I convert a spark dataframe into a pandas dataframe and subsequently apply pandas operations and sklearn models to the dataset in databricks, will the operations from pandas and sklearn be ...
Soorya Paturi's user avatar
3 votes
1 answer
536 views

BERT in production

I've created a BERT model. What are the ways to do the deployment of this model? Is it possible to use it with Spark, Hadoop or Docker?
illuminato's user avatar
3 votes
3 answers
2k views

Does the Koalas library allow to use all Pandas machine learning libraries like Scikit-Learn, XGBoost, and TensorFlow?

I would like to implement a model based on some cleaned and prepared data set. I already have a bit of experience with PySpark, but from a data scientist's perspective it can be cumbersome to work ...
DataBach's user avatar
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2 votes
1 answer
1k views

Scalable way to calculate betweenness centrality for a graph in spark

I have a use-case to calculate betweenness centrality of nodes. I have tried graphx with spark-betweenness but it is a very long running job. Has anyone successfully calculated betweenness centrality ...
abhati's user avatar
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776 views

How to apply K-Medoids in PySpark?

the pyspark ml library does not provide any clustering methods for K-Medoids. So my question is, how can one apply K-Medoids in a pyspark context?
EchoCache's user avatar
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2 votes
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Can i access data on one spark cluster from another? [closed]

What if I want to sample a table over hive on Spark-cluster-1, but I'm logged in on Spark-cluster-2? ...
sAguinaga's user avatar
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1 vote
0 answers
127 views

How to push tasks to remote Hadoop/Spark cluster

I have access to a Hadoop cluster provided by a third party. Currently, I use Spark on this cluster by logging in to a Zeppelin ...
Peter's user avatar
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2 votes
1 answer
897 views

Calculating Rank Ordering Error Metric for implicit recommendation

I'm reading Collaborative Filtering for Implicit Feedback Datasets. On page 6 they detail their evaluation strategy, which they define as mean Expected Percentile Ranking with the following formula: $...
Dan Scally's user avatar
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4 votes
1 answer
16k views

How to select multiple columns in a RDD with Spark (pySpark)?

Lets say I have a RDD that has comma delimited data. Each comma delimited value represents the amount of hours slept in the day of a week. So for i.e. [8,7,6,7,8,8,5] How can I manipulate the RDD so ...
Kent Wong's user avatar
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Regression Task - Spark, PyTorch, TensorFlow or scikit

I know it's a broad question, sorry for that, but I'm still testing the waters with machine learning. I have a typical regression task (predict target numbers with the help of features x,y,z) and a ...
mre's user avatar
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