Questions tagged [accuracy]

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30% accuracy for training set, 80% for test set with a 0.3 split

I have a time series dataset on which I am training. For some reason, the training accuracy is 30% while the test accuracy is about 88% after about 10 epochs. Is this at all normal? I should point ...
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14 views

test accuracy with tensorflow==2.0.0-beta1 vs TensorFlow version: 2.0.0-alpha0

I am trying run same piece of code on both Tensorflow==2.0.0-beta1 and TensorFlow version: 2.0.0-alpha0 In TensorFlow version: 2.0.0-alpha0 I am getting Test accuracy: 85.08% but on Tensorflow==2.0.0-...
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23 views

Unable to understand the usage of labels argument in sklearn.metrics.f1_score

I am trying to model a dataset with RandomForest Classifier. My dataset has 3 classes viz. A, B, C. 'A' is the negative class ...
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9 views

How to gauge overfit with MLPClassifier and cross_val_score?

I'm learning sklearn. When using MLPClassifier.fit() and MLPClassifier.predict() I would ...
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1answer
22 views

Random forest with zero precision for unbalanced test data

Apologies if this is a basic question. I have a very unbalanced dataset in which the records are labelled by one of two classes, class1 (negative class) and class2 (positive class): class 1: 1.5 ...
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6 views

Is veracity in big data theory a good thing to use big data techniques in organization?

I am new to big data field. I know the basic 3V's of it, but I am not understanding the newly added one, which is Veracity. Is it a good thing, which led to taking great analysis from inaccurate data, ...
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2answers
35 views

AUC ROC Threshold Setting in heavy imbalance

I am doing binary logistic regression on a dataset with very heavy class imbalance. Class 1 is only 1% of data. When I train logistic regressor without class weights I get ROC AUC Score of 0.6269. ...
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18 views

Cost decreases, but accuracy doesn't

It looks like the accuracy is stuck somewhere, I am not sure where and which part is still wrong. Feel free to share your thoughts with me, thanks a lot! :) ...
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5 views

Does accuracy scale logarthmic with Learningrates?

This is really general, but: How influential is a relatively small change in learning rate for any given algorithm? influences a change from 0.1 to 0.11 in similar magnitude as 0.0001 to 0.1001? I ...
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17 views

How to describe accuracy/error without ground truth?

I am using machine learning regression models to predict motor scores among a population with spinal cord injury using features derived from their actual movements. Although the clinical measure we ...
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19 views

The effect of removing pooling layers in the model's accuracy

I know that removing pooling layers will lead to an increase in dimensionality and subsequently, make the training to be more time-consuming. But I'm wondering if ...
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11 views

Looking at the graphs, what can I do to increase the accuracy of my neural network

I am trying to solve a regression problem using Keras. The data is time series based and I am using one LSTM layer and two Dense layers. Following code shows the basic model setup ...
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1answer
61 views

How to know if a model is overfitting or underfitting by looking at graph

Just recently got my hands on tensorboard, but can you tell me what features should I look for in the graph (Accuracy and Validation Accuracy) And please do enlighten me about the concept of ...
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30 views

Effect Size in comparison of overall accuracy from Random Forest

I would like to compare two overall accuracy statistics (of a Random Forest classifier). My Data: two samples with each containing 25 features and one categorical class variables (9 different ...
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4answers
174 views

Why is my test data accuracy higher than my training data?

I'm using four years of data, training on the first 3 and testing on the fourth. Using LSTM w/ Keras. My test data set (which has no overlap at all with the training) is consistently performing better ...
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22 views

MAPE as an accuracy measure

I want to run and compare time-series forecast methods. Mean Absolute Squared Error (MAPE) is considered one of the strongest metrics for accuracy. My question is the following: If you do $1-MAPE$ ...
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9 views

Manual setting of target variable based on features' minimum values: f1 score = 1

I am building a classifier for user engagement in my website. Basically, since there are no "proxy" for engagement, i.e. there is no pre-defined target variable, I came up with minimum thresholds ...
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64 views

How to improve accuracy of a binary classification in neural network

I tried to program a binary classifier to predict whether a customer belongs to one class or another. I have over 200k feature vectors, consisting of numeric 12 features each and assume that should ...
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1answer
92 views

Multiclass classification on imbalanced dataset : Accuracy or micro F1 or macro F1

I have a multiclass classification problem. Further, an instance can be assigned to exactly one class. My dataset is highly imbalanced. I know that accuracy is not a good metric to use in this case ...
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17 views

Different accuracy values using the same saved model in tensorflow

I have trained a model in Tensorflow (for some signal classification problem, using mostly convolutional layers, no RNNs), saved It using the callback checkpoints. When I'm testing the said model on a ...
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2answers
243 views

Loss value going down while accuracy remains constant?

While I am training, it seems like my loss is going down, but my accuracy remains constant throughout training. It always seems to go towards 0.0023 no matter how I tweak my network, input data length,...
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124 views

Smaller test data set than training data set in machine learning

I would like to train different machine learning algorithms (SVM, Random Forest, CNN etc.) for the same data set (e.g. MNIST) und then compare their accuracies. The goal would be to find out from ...
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2answers
62 views

Accuracy of the model

I'm using this dataset and i'm trying to do logistic regression ...
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16 views

Accuracy doesn't increase in Binary Classification with 3D coordinates as data

I have 4000 catalogues of galaxies, in each there are 34700 objects, for each of it I have x,y,z coordinates. I want to do a binary classification creating a model which should be able to determine ...
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1answer
109 views

Training accuracy decreases

I have a program in which I use sequence to sequence approach as a prediction model with attention. The problem is, while training, the accuracy is always decreasing at each epoch, like shown in the ...
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1answer
75 views

What could cause training CNN accuracy to drop after 7th epoch?

I am training a CNN on some new dataset. Usually, the accuracy steadily improves over 10-20 epochs. I have created a new but similar dataset (using same methods) but now I see a sharp drop after 7th ...
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1answer
44 views

Can `k=1` be a good choice for K neighbors classification?

Running sklearn.KNeighborsClassifier() on Kaggle's Leaf Classification sample (set of 99 species, 10 specimen each), with defaults kNN parameters and a grid search ...
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2answers
145 views

How to compare paired count data?

I am working with a machine learning approach that counts cars in images. I have a predicted dataset, which is the predicted output from the machine learning approach and a paired "true" dataset, ...
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2answers
659 views

loss/val_loss decrease but acc/val_acc are consistent

I don't know why I am getting such good results. ...
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3answers
613 views

Inverse Relationship Between Precision and Recall

I made some search to learn precision and recall and I saw some graphs represents inverse relationship between precision and recall and I started to think about it to clarify subject. I wonder the ...
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2answers
283 views

loss/val_loss are decreasing but accuracies are the same in LSTM!

I am trying to train a LSTM model, but the problem is that the loss and val_loss are decreasing from 12 and 5 to less than 0.01, but the training set ...
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2answers
50 views

Classifier performance evaluation

I have an unbalanced dataset which has 920 samples in total, 689 belong to the first class, and 222 to second class. and both classes are significant for me. so when building a classifier model such ...
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1answer
65 views

CNN accuracy and loss doesn't change over epochs for sentiment analysis

I am performing text classification as Good [1] or Bad [0]. The texts are preprocessed and converted to Vectors using Google Word2Vec. Further CNN architecture is used for training. I have roughly ...
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1answer
27 views

Accuracy after selftraining didn't change

I used Decisiton Tree Classifier which I trained with 50 000 samples. I have also set with unlabeled samples, so I decided to use self training algorithm. Unlabeled set has 10 000 samples. I would ...
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917 views

Validation vs. test vs. training accuracy. Which one should I compare for claiming overfit?

I have read on the several answers here and on the Internet that cross-validation helps to indicate that if the model will generalize well or not and about overfitting. But I am confused that which ...
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1answer
32 views

Can this be a case of multi-class skewness?

I have been working on an email data set, and trying to predict the owner team for it. But my prediction accuracy is just 58%. I have implemented data cleansing, null value removals, duplicate removal,...
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1answer
178 views

Keras: extreme spike in loss during training

I am training an LSTM for time series forecasting and it has produced an extremly high loss value during one epoch: ...
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1answer
41 views

Why is my training accuracy decreasing higher degrees of polynomial features?

I am new to Machine Learning and started solving the Titanic Survivor problem on Kaggle. While solving the problem using Logistic Regression I used various models having polynomial features with ...
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1answer
599 views

Best CNN architecture for binary classification of small images with a massive dataset [closed]

The title has it all... Any tip is welcomed. Should I use a very deep convolutional neural network ? Use a large amount of filters ? Parallel layers ? Dataset examples: 1) "Good" 2) "Bad"
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1answer
39 views

How do data scientists test the claimed accuracy of a model?

For example, if you are a data scientist at a company, and a salesperson offers you a pre-trained model that is claimed to have a 90% accuracy of detecting fraudulent transactions. How would you go ...
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15 views

Different testing and training accuracy values within a NN TensorFlow structure

In order to select the optimum number of my gradient descent algorithm, I had used a for loop of 1500 iterations and each 100 iterations training and testing accuracies are printed. Here everything is ...
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30 views

Regression model Giving the same prediction for all new inputs until i load the model again

I have build a regression model that has some decent accuracy measures. I have pickled it and loading it another project. However it is producing the same predictions every time when i pass new ...
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1answer
27 views

Autoencoder doesn't learn to reduce dimesions

I coded a neural network from scratch in Python. I tried it with the XOR problem and it learned correctly. So I tried to encode an Autoencoder with 3 inputs (and therefore with also 3 outputs) to ...
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1answer
27 views

My accuracy changes throughout every epoc but the val_acc at the end of each epoc stays the same

I am training a transfer learning CNN on 161 pictures that have been augmented into 966 photos, 4 classes. I am training on a balanced data set, so there are 52 images of each class and also in the ...
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13 views

Is it possible to have a better performance with C4.5 than Bagged tree?

I am not sure but I have read that bagged trees are used to improve the accuracy of a single tree methods such as C4.5 but applying both of them over the same dataset I got better accuracy with C4.5, ...
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22 views

How should multiclass classifier performance be measured when one type of error is preferred over another?

Sorry if this question has been asked before--I am having trouble searching this topic since I'm not sure of my wording. Say you have a classification problem where there are more than two labels ...
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2answers
97 views

Accuracy differs between MATLAB and scikit-learn for a decision tree

Is there any possibility to vary the accuracy of same data set in matlab and jupyter notebook by using python code ? For same data set, at first I applied it in matlab and get 96% accuracy for ...
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1answer
137 views

Metrics for presenting RNN/LSTM result

I am working on a two different architecture based on LSTM model to predict the users next action based on the previous actions. I am wondering, what is the best way to present the result? Is it okay ...
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1answer
149 views

Confidence Score For Trained Sentiment Analyser Model

I have trained a text based sentiment analysis model, using SciKit-learn and custom data. I have the model ready and it works fine in predicting a text to a class (Positive or Negative or Neutral). I ...
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2answers
107 views

How can I know if my NN TensorFlow model is overfitted or not?

I am new with TensorFlow (Python) and I can not juge my obtained results in terms of training and testing accuracy I am using the GradientDescentOptimizer with a learning coeff equal to 10^(-4) and ...