python – Usar variables ciclicas en Random Forest machine learning

He transformado una variable predictora de mi modelo de machine learning en una variable ciclica mediante senos y cosenos. Por lo que entiendo al aplica el Random Forest las variables predictoras son escogidas aleatoriamente para construir cada uno de los árboles. Al suceder esto es muy probable que no haya árboles dentro del modelo que tengan solo el cosenos y otras solo el seno. Esto podría resultar un problema?

Pasaría lo mismo si he codificado variables categóricas en dummievariables?


puerto rico – El Yunque or "El Junque" National Forest Pronunciation

The internet seems to be full of disagreements about how to pronounce the El Yunque National Forest in Puerto Rico. Here is a small sample:

  • The website of the US Forest Service. USA He claims that it is el-ZHUN-kay (although as a word it is Spanish, I do not think it really makes sense; said this may or may not be of Taíno origin)
  • Mario González, the executive director of the Puerto Rico Tourism Company pronounces it "YOON-kay"
  • Respondents to this thread use "Yun-K" and "June-Kay"
  • However, a Reddit user who claims to have lived in Puerto Rico all his life says that "You cannot pronounce the word Yunque with a J"
  • But the Colorado School of Mines library actually spells it El Junque.

How do I know which one is the right one not to spoil it and why is it so confusing? (For example, if "YOON-kay" is correct, why are so many people saying "JOON-kay"? That's not an obvious mistake an English speaker would make!)

Do you think Trump is wrongly blamed for the Coronavirus spreading like a forest fire?

Trump was warned about the arrival of the virus, long before WE knew anything about it. He bet that if he ignored it, it would disappear. He lost that bet!

When finally, belatedly, he decided he had to do something, he screwed it up. He never developed a real plan, preferring to & # 39; play it by ear & # 39; at press conferences and interviews. He still tried to convince the Americans that it was not a problem, that it would just go away on its own. He did not understand that time is very important in a crisis like this. He showed an insensitive insensitivity to the lives of Americans. So when he finally decided to take control, he threw it very badly.

Right now, what we desperately need now is to test. Trump did not WANT the test, because he feared that the number of people infected with the virus would surprise and scare us, and harm his chances of reelection. So, at this point, you are pressuring states to reopen regardless of whether they know how widespread the virus is. But he says that if it does reopen, he wants us all to realize that IT IS HIS CHOICE, that he is not responsible for the increase in the death rate that will result from a premature reopening.

It cannot be denied that thousands of Americans will die, otherwise they would not because of Trump's egregious handling of the entire Corona Virus situation. However, Trump is still not responsible and blames the problem he can think of. And every time Trump even talks about the issue, it's totally obvious that he's more concerned with the political implications than with the lives of Americans.

dnd 5e – How can I help my group find a secret path in a forest?

I am trying to plan the main plots of what will happen in the next session of my campaign.

Currently my party is in a forest; They have been traveling for a while and recently spent time traveling in the exact opposite direction of where they wanted to go. Finally they met again where they started in the first session. I felt this was hard, but they chose the path they traveled on.

I want you to find a hidden secret path, in an area where you have already been. This is the route to your original destination. The entrance to the path is hidden beyond a forest of trees; in a valley, by the path known as the lowland path. I currently can't think of a reason for them to follow that path. Much less find the secret path.

How can I help my players find the hidden path to their destination?

data structures – Benefits of linked forest lists for disjoint sets

CLRS analyzes two specific data structures for disjoint sets:

  • Individual linked lists, where each set is represented by a single linked list, and each node has two pointers, one for the list header and one for the next node.
  • The forests, where each set is represented by a tree and each tree node has only one pointer, with this pointer pointing to its parent in its tree.

From what I can tell, forests with path compression and range / size join are superior, i.e. they have better deprecated run time for common disjoint set operations (find / join / do) and also use less memory ( one pointer instead of two per node).

Are there any benefits or scenarios where it makes sense to use linked lists?

Note: Technically speaking, although CLRS does not explicitly mention this, a way to find / search for tree nodes is often needed in practice, so one would need additional pointers per tree node or an array / dictionary containing pointers to the nodes tree (that is, the benefits of memory are not really clear), but beyond that, forests simply look better.



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programming challenge – LeetCode: Delete nodes and return C # forest

Given the root of a binary tree, each node in the tree has a different value.

After removing all nodes with a value in to_delete, we are left with a forest (a disjoint union of trees).

Returns the roots of the trees in the remaining forest. You can return the result in any order.

enter the image description here

Input: root = (1,2,3,4,5,6,7), to_delete = (3,5) Output:
((1,2, null, 4), (6), (7))


The number of nodes in the given tree is a maximum of 1000. Each node has a
different value between 1 and 1000. to_delete.length <= 1000 to_delete
contains different values ​​between 1 and 1000.

Please check the performance and style.

using System.Collections.Generic;
using System.Linq;
using GraphsQuestions;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace TreeQuestions
    public class DeleteNodesAndReturnForestTest
        public void ExampleTest()
            var root = new TreeNode(1);
            root.left = new TreeNode(2);
            root.left.left = new TreeNode(4);
            root.left.right = new TreeNode(5);
            root.right = new TreeNode(3);
            root.right.left = new TreeNode(6);
            root.right.right=new TreeNode(7);
            var gili=new DeleteNodesAndReturnForest();
            var res = gili.DelNodes(root, new() {3, 5});


    public class DeleteNodesAndReturnForest
        List _forest;
        public IList DelNodes(TreeNode root, int() to_delete)
            if (root == null || to_delete == null || to_delete.Length == 0)
                return _forest;
            _forest = new List();
            Helper(root, to_delete);
            if (!to_delete.Contains(root.val))
            return _forest;

        private TreeNode Helper(TreeNode root, int() to_delete)
            if (root == null)
                return null;
            //first do the recursion
            root.left = Helper(root.left, to_delete);
            root.right = Helper(root.right, to_delete);
            //when coming back from recursion(post-order). all the subtrees is already deleted
            //delete root and add to the forest the left and right leaves
            if (to_delete.Contains(root.val))
                if (root.left != null)
                if (root.right != null)

                return null;

            return root;

O365 Hybrid: Can we select certain organizational units and mailboxes to migrate instead of the entire forest?

This is probably a silly question to ask.

1] When we do Azure Active Directory Connect to sync local Active Directory, can we select a particular organizational unit that stores all active staff instead of the entire forest?

In addition to user objects, I think other AD objects are also synchronized.

Can we define which organizational units to synchronize?

2] In the same way, when we run the hybrid setup wizard, can we just select to migrate a selected list of mailboxes but not all mailboxes?

Similarly for distribution groups, can we select a certain number to migrate?

Thanks in advance.

graphics: count bridge edges in a two-component forest family

Give me a graph (simple, not directed, connected) $ G = (V, E) $ and a fixed spanning tree $ T $ in this graphic Delete a border $ e in E (T) $ since $ T $ divides it into a forest that stretches $ F ^ e $ with two components $ F_1 ^ e $ Y $ F_2 ^ e $. I am interested in the number $ c (e) $ of edges in $ G $ that connect $ F ^ e $ that is, with a vertex in $ F_1 ^ e $ and the other in $ F_2 ^ e $.

I would like to calculate the number $ c (e) $ for all $ e $ in $ T $ simultaneously. This can be done naively in $ O (| V || E |) $. Is there a faster way to accomplish this?

The charts I'm working with are small world charts. In particular, the average distance between nodes in $ G $ it can be assumed that it is small.