trees | project provides trees data structure | Dataset library

I am trying to follow this tutorial here - https://juliasilge.com/blog/xgboost-tune-volleyball/

I am using it on the most recent Tidy Tuesday dataset about great lakes fishing - trying to predict agency based on many other values.

ALL of the code below works except the final row where I get the following error:

I'm building a web app using Laravel 8 and one thing I tend to struggle with is the complex relationships and accessing the data. I've started reading on hasManyThrough relationships but I'm not convinced that's the correct way to do it for my scenario.

The app is used by travelling salesmen to check in to a location when they arrive safely.

I have three main tables:

• Locations (where they are visiting),
• Checkins (where their check in data is stored, e.g. time),
• Users

This is where it gets a little complex and where I find myself not being able to see the wood for the trees...

• Locations have many users, users have many locations. Many-to-many pivot table created.
• Locations have many check ins, check ins have many locations. Many-to-many pivot table created.
• Check ins have many users, users have many check ins. Many-to-many pivot table created.

As such they're all created using a belongsToMany relationship.

Now what I'd like to do is access the user of the check in so I can call something similar to on my show.blade.php:

Can I find out in Git2-rs / libgit2 about the status of a file like added/removed/modified from the commit log? I've looked at the documentation but only find Diff Trees.

I made a lisp code that transforms a list of numbers into a tree. The rules of the tree are that the value of the left child node should always be smaller than the value of its parent node and the value of the right child node should always be higher than the value of its parent node.

Here is my lisp code:

I'm working on this assignment and I can't seem to stop this read access violation error. I am new to C++ and I think part of my issue is using pointers when they aren't necessary (I think), but I've also looked at this code and traced through it so many times with the debugger that I think I'm missing something obvious.

The assignment is to implement a Huffman encoder. To do this I have to create a HuffmanTree class and a HuffmanProcedure class, and I am provided with a (mostly) complete Heap class (minheap).

The HuffmanProcedure class has to use the Heap class to store and create HuffmanTrees until I have a Huffman code for every single lowercase letter.

When running the code, I get a read access violation error in the helper I wrote for my Tree destructor, treeRemovalHelper.

The specific error I get (using Visual Studio 2019 targeting C++11): Exception thrown: read access violation. root was 0xDDDDDDDD

Here's where the error is occurring:

I struggle with very strange behaviour while trying to compare two ints but first things first. Here is my method inside the class:

I have trained a churn tidymodel with customer data (more than 200 columns). Got a fairly good metrics using xgbboost but the issue is when tryng to predict on new data.

Predict function asks for target variable (churn) and I am a bit confused as this variable is not supposed to be present on real scenario data as this is the variable I want to predict.

sample code below, maybe I missed the point on procedure. Some questions arised:

1. should I execute prep() at the end of recipe?

2. should I execute recipe on my new data prior to predict?

3. why removing lines from recipe regarding target variable makes predict work?

4. why is asking for my target variable?

   ...

How to create a list with the y-axis labels of a TreeExplainer shap chart?

Hello,

I was able to generate a chart that sorts my variables by order of importance on the y-axis. It is an impotant solution to visualize in graph form, but now I need to extract the list of ordered variables as they are on the y-axis of the graph. Does anyone know how to do this? I put here an example picture.

Obs.: Sorry, I was not able to add a minimal reproducible example. I don't know how to paste the Jupyter Notebook cells here, so I've pasted below the link to the code shared via Github.

In this example, the list would be "vB0 , mB1 , vB1, mB2, mB0, vB2".

minimal reproducible example

I'm solving the example probation problem in Python and had only partial success so far (passed 30 test cases, wrong answer in the 31st). The test cases themselves are not disclosed.

Description.

A network of n nodes connected by n-1 links is given. Find two nodes so that the distance from the fatherst node to the nearest of those two would be minimal. If several answers are possible, any of them will be accepted.

The input is given as a list of pairs of numbers. Each number represents node, pair is the connection between two nodes. The result should be the list of two nodes.

Example 1 in = [[1, 2], [2, 3]] result = [3, 1]

Example 2 in = [[1, 2], [3, 2], [2, 4], [4, 5], [4, 6]] result = [2, 4]

My solution.

The net will always be a tree, not a graph. For the above examples the corresponding trees will be:

example 1