Sparklyr

Kevin Feasel

2016-10-04

R, Spark

RStudio has announced an interface between R and Apache Spark, named sparklyr:

Over the past couple of years we’ve heard time and time again that people want a native dplyr interface to Spark, so we built one! sparklyr also provides interfaces to Spark’s distributed machine learning algorithms and much more. Highlights include:

  • Interactively manipulate Spark data using both dplyr and SQL (via DBI).

  • Filter and aggregate Spark datasets then bring them into R for analysis and visualization.

  • Orchestrate distributed machine learning from R using either Spark MLlib or H2O SparkingWater.

  • Create extensions that call the full Spark API and provide interfaces to Spark packages.

  • Integrated support for establishing Spark connections and browsing Spark DataFrames within the RStudio IDE.

So what’s the difference between sparklyr and SparkR?

This might be the package I’ve been awaiting.

Using Xgboost In Azure ML Studio

Koos van Strien wants to use the xgboost model in Azure ML Studio:

Because the high-level path of bringing trained R models from the local R environment towards the cloud Azure ML is almost identical to the Python one I showed two weeks ago, I use the same four steps to guide you through the process:

  1. Export the trained model

  2. Zip the exported files

  3. Upload to the Azure ML environment

  4. Embed in your Azure ML solution

Read the whole thing.

Storing R Graphs In FileTable

Kevin Feasel

2016-09-26

R

Tomaz Kastrun shows how to save R plots in SQL Server FileTable:

FileTable has been around now for quite some time and and it is useful  for storing files, documents, pictures and and binary files in a designated SQL Server table – FileTable. The best part of FileTable is the fact one can access it from windows or other application as if it were stored on file system (because they are) and not making any other changes on the client.

And this feature is absolutely handy for using and storing outputs from Microsoft R Server. In this blog post I will focus mainly on persistently storing charts from statistical analysis.

I can see this being quite useful for things like automatically sampling data for quality control.

XGBoost

Koos van Strien moves from Python to R to run an xgboost algorithm:

Note that the parameters of xgboost used here fall in three categories:

  • General parameters

    • nthread (number of threads used, here 8 = the number of cores in my laptop)
  • Booster parameters

    • max.depth (of tree)
    • eta
  • Learning task parameters

    • objective: type of learning task (softmax for multiclass classification)
    • num_class: needed for the “softmax” algorithm: how many classes to predict?
  • Command Line Parameters

    • nround: number of rounds for boosting

Read the whole thing.

One-Sample T Tests

Kevin Feasel

2016-09-21

R, T-SQL

Mala Mahadevan shows how to perform one-sample T Tests:

For this post I decided to go with a simple example of how many steps I walked with my per day for the month of August. My goal is 10,000 steps per day – that has been my average over the year but is this true of the data I gathered in August? I have a simple table with two columns – day and steps. Each record has how many steps I took in August per day, for 30 days. So – SELECT AVG(steps) FROM [dbo].[mala-steps] gives me 8262 as my average number of steps per day in August. I want to know if am consistently under performing my goal, or if this is a result of my being less active in August alone. Let me state my problem first – or state what is called ‘null hypothesis’:

I walk 10,000 steps on an average per year. 

Read on for T test operations in T-SQL (although not all operations are available) and R.

Analyzing The StackLite Dataset

Kevin Feasel

2016-09-20

R

Marco Pasin looks at the StackLite data set:

According to Stack Overflow documentation, these are the categories of questions that may be closed by the community users:

  • duplicated
  • off topic
  • unclear
  • too broad
  • primarily opinion-based
Not everyone in the Stack Overflow community is able to close a question. In fact users need to have certain reputation expressed in points (more details here).

To calculate the overall website closure rate is easy. Just use the original “questions_2016” dataset and count how many questions have the field “Closed Date” populated. Over 10% of questions made in 2016 have been closed so far.

If you’re interested in learning more about data analysis, walk through the exercise as well and play around with the data set too.  Hat tip, R-Bloggers.

Running A Model On Separate Groups Of Data

Kevin Feasel

2016-09-20

R

Simon Jackson shows how to run the same model against separate groups of data in R:

Now that we can separate data for each group(s), we can fit a model to each tibble in data using map() from the purrr package (also tidyverse). We’re going to add the results to our existing tibble using mutate() from the dplyr package (again, tidyverse). Here’s a generic version of our pipe with adjustable parts in caps:

Read the whole thing.  Hat tip, R-Bloggers.

Lubridate Updates

Hadley Wickham reports on a Lubridate update:

  • Date time rounding (with round_date()floor_date() and ceiling_date()) now supports unit multipliers, like “3 days” or “2 months”:

    ceiling_date(ymd_hms("2016-09-12 17:10:00"), unit = "5 minutes")#> [1] "2016-09-12 17:10:00 UTC"

If you handle date and time data in R, Lubridate is a tremendous asset.

Predictive Maintenance Solution Template

Kevin Feasel

2016-09-14

R

Jaya Mathew has a SQL Server R Services template for predictive maintenance:

To illustrate the scenario, we will focus on companies who operate machines which encounter mechanical failures. These failures lead to downtime which has cost implications on any business, hence most companies are interested in predicting the failures ahead of time so that they can proactively prevent them. This scenario is aligned with an existing R Notebook published in the Cortana Intelligence Gallery but works with a larger dataset where we will focus on predicting component failures of a machine using raw telemetry, maintenance logs, previous errors/failures and additional information about the make/model of the machine. This scenario is widely applicable for almost any industry which uses machines that need maintenance. A quick overview of typical feature engineering techniques as well as how to build a model will be discussed below.

Understanding when machines are likely to break down is a very interesting statistical problem.  Check out the template.

Chi Square Tests

Mala Mahadevan discusses how to perform a Chi Square test:

For any dataset to lend itself to the Chi Square test it has to fit the following conditions  –

1 Both  variables are categorical (in this case – exposure to smoking – yes/no, and health condition – sick/not sick are both categorical).
2 Researchers used a random sample to collect data.
3 Researchers had an adequate sample size.Generally the sample size should be at least 100.
4 The number of respondents in each cell should be at least 5.

This is an easy case for using R over T-SQL—the Chi Square test is built in, whereas you have to roll your own T-SQL code.  Mala does show you how to do this from within SQL Server R Services as well.

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