data-mining | Related cases and demos of data mining
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Related cases and demos of data mining
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QUESTION
I'm working on a Naïve Bayes Classifier algorithm for my data-mining course, however I'm having an underflow problem when calculating the probabilities. The particular data set has ~305 attributes, so as you can image, the final probability will be very low. How can I avoid this problem?
...ANSWER
Answered 2021-Feb-19 at 17:57One way to go is to process the logarithms of the probabilities rather than the the probabilities themselves. The idea is you never calculate with probabilities, for fear you'll get 0.0, but instead calculate with log-probabilities.
Most of the changes are easy: eg instead of multiplying the probabilities, add the logarithms and for many distributions (eg gaussians) its easy to compute the log-probability rather than the probability.
The only slightly tricky bit is if you need to add up probabilities. But this is a well known problem, and searching for logsumexp gets plenty of hits, eg here. I believe there is a logsumexp function int scipy.
QUESTION
So basically I'm doing a project for my Degree (I do EEE, but the subject is on Machine Learning). I want to get a list of all the Reuters news articles using web browser through C#. Once I get the individual HREF links I would use HTML Agility Pack to extract the text of the individual articles and do some data-mining.
But for a search I make (https://www.reuters.com/search/news?blob=Trump&sortBy=date&dateRange=all), there are thousands of results displayed, and I need to click on a "Load More Results" button on the page. I have tried certain methodologies found online, but it doesn't work! Any help would be appreciated!
The button's HTML description is the following:
...ANSWER
Answered 2020-Feb-03 at 02:48try this:
QUESTION
Description:
Currently I am working on using Flink with an IOT setup. Essentially, devices are sending data such as (device_id, device_type, event_timestamp, etc) and I don't have any control over when the messages get sent. I then key the steam by device_id and device_type to preform aggregations. I would like to use event-time given that is ensures the timers which are set trigger in a deterministic nature given a failure. However, given that this isn't always a high throughput stream a window could be opened for a 10 minute aggregation period, but not have its next point come until approximately 40 minutes later. Although the calculation would aggregation would eventually be completed it would output my desired result extremely late.
So my work around for this is to create an additional external source that does nothing other than pump fake messages. By having these fake messages being pumped out in alignment with my 10 minute aggregation period, even if a device hadn't sent any data, the event time windows would have something to force the windows closed. The critical part here is to make it possible that all parallel instances / operators have access to this fake message because I need to close all the windows with this single fake message. I was thinking that Broadcast state might be the most appropriate way to accomplish this goal given: "Broadcast state is replicated across all parallel instances of a function, and might typically be used where you have two streams, a regular data stream alongside a control stream that serves rules, patterns, or other configuration messages." Quote Source
Questions:
- Is broadcast state the best method for ensuring all parallel instances (e.g. windows) receive my fake messages?
- Once the operators have access to this fake message via the broadcast state can this fake message then be used to advance the event time watermark?
ANSWER
Answered 2019-Dec-18 at 14:59You can make this work with broadcast state, along the lines you propose, but I'm not convinced it's the best solution.
In an ideal world I'd suggest you arrange for the devices to send occasional keepalive messages, but assuming that's not possible, I think a custom Trigger would work well here. You can extend the EventTimeTrigger so that in addition to the event time timer it creates via
QUESTION
I try to run my machine-learning code on databricks(community version) and need to use the Orange3 data-mining library. However, when I tried to create the orange3 library, it gives an error like this:
...ANSWER
Answered 2019-Oct-28 at 01:55Python 3 is now the default when creating clusters and there's a UI dropdown to switch between 2 or 3 on older runtimes. 2 will no longer be supported on Databricks Runtime 6+.
The docs give more details on the various Python settings.
In regards to specific versions, it depends on the Runtime you're using.
For instance:
- 5.5 LTS runs Python 3.5
- 5.5 LTS ML runs Python 3.6
- 5.5 with Conda runs Python 3.7
- 6.0 and 6.1 both run 3.7
QUESTION
i have build a URL-Routing FrontController in PHP. All works fine, but now i find a error, if i have more params then 2 it dont works, for example:
This URL works:
"www.comelio.com/business-intelligence/anleser/"
but this URL dont works:
"www.comelio.com/business-intelligence/data-mining/anleser/"
My Rewrite Rule:
...ANSWER
Answered 2019-Jul-03 at 07:51Have a look at the htaccess Tester here (Make sure to add http in the URL field).
In your Rewrite Condition, you only make the slashed optional. Thus, the rewriter will always split up the request url to match 4 parts. Try changing your rule to
QUESTION
I've got a set of data stored in a "numpy" array:
...ANSWER
Answered 2018-Dec-07 at 11:29Orange is able to convert a Panda dataframe into Orange's table, so first convert your data into a Panda dataframe:
QUESTION
in Impute widget, there is option "Model-based(simple tree)" for imputation method
How to do this in Python Script Widget ?
from this documentation (https://docs.orange.biolab.si/3/data-mining-library/reference/preprocess.html#feature-selection) , i know how to Impute
...ANSWER
Answered 2018-Aug-26 at 11:36By analogy, even though a tad more complicated:
QUESTION
I can't create one new column with the cumulative sum of another. Orange documentation is to hard to understand if you are new to Python like me.
This is the code i have in my Python Script Widget
...ANSWER
Answered 2017-Oct-05 at 07:37Try:
QUESTION
Trying to practice Java by doing basic functionality like reading input.
I am trying to parse movies-sample.txt found in:
ANSWER
Answered 2018-Mar-16 at 08:23If it's a web app then the resources folder is your root element, otherwise it will be the src folder as mentioned in comments.
In your case here as you are writing a standalone Java program and as your file is loacted in the resources folder, you can use CLassLoader to read the file as a stream.
This is how should be your code:
QUESTION
CAn anyone tell me please what is wrong with my code: Below is my spark code in scala:
...ANSWER
Answered 2018-Mar-08 at 21:56I assume that
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You can use data-mining like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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