Data Science

Questions tagged [noise]

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Denoising Prior to Image Classification

From what I have read, Denoising during preprocessing for image classification tasks seems to be a bit controversial. While on one hand it might improve classification accuracy, the computational ...
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16 views

Finding clusters of 3D points where not all the points belong to a cluster

In my research, I'm trying to find clusters of brain activity, like in the following image: Where the red dots represent the origin of the activity (where the green pole is the direction). So ...
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22 views

Noisy features detection

Based on the library featexp I am trying to identify noisy categorical features. I want to know if this is the right way and if there is some library for this solution it will be great to know it. I ...
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1answer
347 views

Choosing attributes for k-means clustering

The k-means clustering tries to minimize the within-cluster scatter and maximizing the distances between clusters. It does so on all attributes. I am learning about this method on several datasets. To ...
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2answers
36 views

Which algorithm to use to identify clusters with a similar value?

Here, an example of my problem: 10000 observations of people with several features [age, gender, region, number of sons, ...] and a value to predict "income". There is not a general relationship ...
2
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1answer
48 views

Methods for learning with noisy labels

I am looking for a specific deep learning method that can train a neural network model with both clean and noisy labels. More precisely, I would like this method to be able to leverage noisy data as ...
2
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1answer
75 views

Remove noise by clustering on which step of pre-processing is better?

I am working on a classification task. The dataset is a UCI data set about machine learning with 200 observations and 2 classes. Part of my model includes the following preprocessing steps: remove ...
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0answers
16 views

Classification Algorithms For Noisy Problems

Dear fellow data scientists I work in finance and have decent experience with neuronal networks. Right now I am facing a challenge where I need to classify a set of signals. The data set looks ...
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2answers
236 views

If my model is overfitting the training dataset, does adding noise to training dataset help regularizing the machine learning model

I would like to know if this is a best practice or not. Can we add noise to the training data to help the model "fit less the training data"; as a result, hoping to generalize better on new unseen ...
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0answers
50 views

How to remove noise using morphological filtering

I have two groups of dots that both contain noise between them: The line that separates the two groups in the picture is diagonal in shape. I tried to use morphological filtering on this image to ...
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1answer
118 views

Noise Elimination with majority vote filtering

I have a dataset with label noise which I wan't to clean with majority/consensus vote filtering. This will mean I will divide the data in K-Folds and train an ensemble model. Than using the ...
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0answers
18 views

Isolated/noisy instances that have outsized effect on SVM hyperplane selection

Consider two linearly separable classes and the optimal separating hyperplane (image credit Prof Jiawei Han of UIUC): Now consider if there were a single "rogue" point for the Yellow class - which ...
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1answer
1k views

what is correct way to perform normalization on data in Auto encoder?

working on anomaly detection problem. i'm using auto-encoder to denoise given input. I trained network with normal data(anomaly free). so model predict normal state of given input. Normalization of ...
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167 views

Training deep CNN with noisy dataset

I am training a Mask RCNN model with a train dataset that has been generated from some simple computer vision operations (color thresholding) and some morphological filtering. The train set captures ...
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1answer
1k views

Effect of adding gaussian noise to the input layer in a CNN

I often come across Keras code that adds GaussianNoise to the input, however its not clear to me what advantages does it offer to the learning. ...
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1answer
634 views

How to create a complex Gaussian random noise with a specific covariance matrix

I am trying to generate a complex Gaussian white noise, with zero mean and the covariance matrix of them is going to be a specific matrix which is assumed to be given. Assume i to be a point on the ...
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1answer
31 views

How can I avoid requiring global information for performing regression on meter variables?

Note: With a meter variable a timestamped value is the sum of all previous differences plus a difference to the most recent value. Think of a electricity meter counting the use of energy. The goal ...
2
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1answer
97 views

Paramaeter estimation in noisy conditions with Machine Learning, possible?

Let's take two constants, $\alpha$ and $\beta$, both are given by two functions $f_1(\vec{\theta})$ and $f_2(\vec\theta$) (the model). These functions are known: we have an analytical closed ...
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0answers
191 views

Rain radar image noise reduction and cleanup

An application that I am building is plotting rain radar images on map. The images are transparent PNGs that are sourced straight from the local meteorological service. As can be seen in the example, ...
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1answer
1k views

Training on accurate data versus noisy data

I have data currently available that is very accurate and I would like to train my classification methods on this set of clean data to learn the important markers for distinguishing between classes. ...
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1answer
49 views

Reducing noisy data from non normal distribution of data with std deviation?

I have used MATLAB code and get the two different row vectors A=1×18 and B=1×350. From both row vectors separately I need to remove the noisy data by using standard deviation. But the problem is that ...
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2answers
93 views

What is the loss function defined by Mnih and Hinton in their paper “Learning to Label Aerial Images from Noisy Data”?

In section 3.3 of the paper, they state that they use the cross entropy. Then they define the probability for a label to be a false positive as $\theta_0$ and a false negative as $\theta_1$. They use ...
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1answer
28 views

When we should use binning to redure noise? or How we find out we have noise?

I read several times which binning is helpful for reducing the noise of data. But how can we find out our data has noise? What if our data is clean and we reduce the accuracy of data? Is there any ...
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0answers
74 views

Rprop is too noisy

Is there a way to reduce the noisiness and stochasticity of Rprop (and for that matter the iRprop+)? Specifically, in deep networks (with 8+ layers) this effect starts to become apparent, as the ...
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2answers
4k views

Can Neural Networks be trained to smooth values / output the average?

Let's say we have a neural network with one input neuron and one output neuron. The training data $(x, f(x))$ is generated by a process $$f(x) = ax + \mathcal{N}(b, c)$$ with $a, b, c \in \mathbb{R}^...