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2 2 votes
1 answers 1 answer
23.3k
23.3k views
How to calculate Covariance Matrix and Principal Components for PCA?
The dataset with two features $(x,y)$ is shown as follows (note $y$ in this example is the second feature, not a target value):xy2.52.40.50.72.22.91.92.23.13.02.32.72.01....
2 2 votes
1 answers 1 answer
21.9k
21.9k views
How to calculate k-means clustering with a numerical example?
Use the k-means algorithm and Euclidean distance to cluster the following 8 examples into 3 clusters:$A1=(2,10), A2=(2,5), A3=(8,4), A4=(5,8), A5=(7,5), A6=(6,4), A7=(1,2...
4 4 votes
1 1 answer
20.7k
20.7k views
Can you share with us how to download ipynb file as pdf through latex?
1 1 vote
1 answers 1 answer
15.8k
15.8k views
How to update "conda" version itself?
I can update all the libraries and packages on Anaconda using the following command:conda update all But it does not update conda itself. Is there any special command fo...
2 2 votes
1 answers 1 answer
15.1k
15.1k views
How to calculate Accuracy, Precision, Recall or F1?
In the following example, calculate Accuracy, Precision, Recall or F1?https://i.imgur.com/OezFpqC.png
1 1 vote
1 1 answer
14.5k
14.5k views
What is the difference between univariate and multivariate analysis?
3 3 votes
2 2 answers
14.1k
14.1k views
What happens as the K increases in the KNN algorithm ?
I am wondering what happens as K increases in the KNN algorithm. It seems that as K increases the "p" (new point) tends to move closer to the middle of the decision bound...
2 2 votes
1 answers 1 answer
13.9k
13.9k views
How to calculate probability in Logistic Regression?
The dataset of pass/fail in an exam for 5 students is given in the table below. If we use Logistic Regression as the classifier and assume the model suggested by the opti...
1 1 vote
2 answers 2 answers
13.2k
13.2k views
score() vs accuracy_score() in sklearn
Hi,Since I still have confuse to use the score() and accuracy_score(), so I want to confirm my test assumption.Q1: score(), we use the split data to test the accuracy by...
2 2 votes
2 2 answers
11.7k
11.7k views
How to optimize weights in Logistic Regression?
The hypothesis (model) of Logistic Regression which is a binary classifier ( $y =\{0,1\} $) is given in the equation below:Hypothesis$S(z)=P(y=1 | x)=h_{\theta}(x)=\frac{...
3 3 votes
1 answers 1 answer
11.4k
11.4k views
How to calculate Softmax Regression probabilities?
The scatter plot of Iris Dataset is shown in the figure below. Assume Softmax Regression is used to classify Iris to Setosa, Versicolor, or Viriginica using just petal le...
5 5 votes
1 answers 1 answer
10.4k
10.4k views
How to calculate convolutions on a CONV layer for a Convolutional Neural Network?
Assume we have a $5\times5$ px RGB image with 3 channels respectively for R, G, and B. IfR2000012001201021210101020G0212211100002202002002111B0100111201102021011012112 We...
3 3 votes
1 answers 1 answer
10.1k
10.1k views
How to calculate feed-forward (forward-propagation) in neural network?
In the figure below, a neural network is shown. Calculate the following:1) How many neurons do we have in the input layer and the output layer?2) How many hidden layers d...
1 1 vote
1 1 answer
10.1k
10.1k views
In DBSCAN algorithm, how should we choose optimal eps and minimum points?
3 3 votes
2 answers 2 answers
8.8k
8.8k views
How to calculate Softmax Regression probabilities in this example?
The scatter plot of Iris Dataset is shown in the figure below. Assume Softmax Regression is used to classify Iris to Setosa, Versicolor, or Viriginica using just petal le...
3 3 votes
1 answers 1 answer
8.6k
8.6k views
How to update weights in backpropagation algorithm (a numerical example)?
Assume we have the following neural network and all activation functions are $f(z)=z$. If the weights are initialized with the values you see in table below, what will be...
0 0 votes
1 1 answer
8.5k
8.5k views
How to calculate the residual errors, (MSE),(MAE), and (RMSE)?
Given the following sample dataset with 5 samples and 2 features:SampleFeature 1Feature 2Actual ValuePredicted Value1234623456345674567856789Calculate the residual errors...
3 3 votes
1 answers 1 answer
8.4k
8.4k views
How to calculate the probability and accuracy of a Logistic Regression classifier?
How to solve this problem?https://i.imgur.com/8urywpf.jpgQ1) Complete the ? sectionsQ2) Accuracy of system if threshold = 0.5?Q3) Accuracy of system if threshold = 0.95?
1 1 vote
0 0 answers
8.1k
8.1k views
Looking for guidance on whether I have the necessary data to answer a Regression question
Hi everyone.I'm currently working on my final project for a Data Science degree and after a month of literature review, exploratory analysis and model testing, I'm not su...
4 4 votes
1 answers 1 answer
8.0k
8.0k views
How to perform a classification or regression using k-NN?
Suppose, you have given the following dataset where x and y are the 2 features and color Red or Blue is the target variable.a) A new data point $x=1$ and $y=1$ is given. ...
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