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Recent questions tagged ml-exercise

0 0 votes
1 answers 1 answer
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How to calculate feed-forward (forward-propagation) in neural network for classification?
For the following neural network, calculate accuracy of classification, given these settings
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1 1 answer
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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...
0 0 votes
1 answers 1 answer
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How to create a Decision Tree using the ID3 algorithm?
NASA wants to be able to discriminate between Martians (M) and Humans (H) based on thefollowing characteristics: Green ∈{N, Y }, Legs ∈{2, 3}, Height ∈{S, T}, Smelly ∈{N,...
3 3 votes
1 answers 1 answer
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How to update the weights in backpropagation algorithm when activation function in not linear?
The goal of backpropagation is to optimize the weights so that the neural network can learn how to correctly map arbitrary inputs to outputs.Assume for the following neur...
2 2 votes
1 answers 1 answer
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How to calculate the class probabilities and classify using Naive Bayes classifier?
We have data on 1000 pieces of fruit. The fruit being a Banana, Orange or some Other fruit and imagine we know 3 features of each fruit, whether it’s long or not, sweet o...
1 1 vote
1 answers 1 answer
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How to calculate residual errors for linear regression and interpret regression metrics?
Assuming we have a linear regression equation and some data points (sample), how can we calculate residual error for each data point, and total cost based on the metrics ...
3 3 votes
1 answers 1 answer
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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?
2 2 votes
1 answers 1 answer
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How to calculate Accuracy, Precision, Recall or F1?
In the following example, calculate Accuracy, Precision, Recall or F1?https://i.imgur.com/OezFpqC.png
4 4 votes
1 answers 1 answer
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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. ...
2 2 votes
1 answers 1 answer
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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...
2 2 votes
1 answers 1 answer
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How to calculate the class probabilities and classify using Naive Bayes classifier for NLP?
We want to use Naive Bayes for tagging documents. It is a classification task that we want to assign a class (tag) to each string. We currently have two tags: Sport and N...
2 2 votes
1 answers 1 answer
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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....
5 5 votes
1 answers 1 answer
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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...
2 2 votes
2 2 answers
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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
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7.4k 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 answers 1 answer
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How to calculate univariate linear regression?
For the following dataset, calculate the regression equation $\hat{y} = ax+b$datasetxy1423501075161002615036200
3 3 votes
2 answers 2 answers
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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
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9.4k 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...
2 2 votes
1 answers 1 answer
6.6k
6.6k views
How to update weights using gradient decent algorithm?
For the below neural network, imagine we are going to use the backpropagation algorithm to update weights. If the Bias (b) in this problem is always 0 (ignore bias when y...
3 3 votes
1 answers 1 answer
10.8k
10.8k 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...
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