Questions tagged [gridsearchcv]
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37
questions
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22 views
How many trees does a random forest need?
At first, I did a GridsearchCV and the best parameter is a random forest with just 100 trees. My trainset has 80.000 rows and 669 columns. My test set has 20.000 rows and 669 columns.
How is it ...
4
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2answers
29 views
It is alright to split a GridSearchCV?
Is it ok to split a GridsearchCV?
At first, I would try estimators from 100 - 300 (100 steps) for a random forest regressor and some other parameters and after that GridsearchCV I would start the ...
1
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1answer
20 views
Why does my GridSearcCV always break up?
after two days running my GridSearchCV for my random forest twice my GridSearch breaks up. I want to know if anybody could see what is the reason therefore or what can i do that it doesnt happend ...
2
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2answers
78 views
How to plot number of Trees and OOBs score with Grid Search
I searched to find the answer but I don´t find something with Grid Search.
I create a random forest and gradient boosting regressor with grid search. Now I want to make a visualization to see if the ...
2
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1answer
32 views
Can we apply to GridSearchCV to Logistic regression .?
When I apply GridSearchCV to my model Logistic Regression, it's continuously throwing below error.
I understand that it's trying to convert string to float. But that's was my data. So how can I ...
3
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1answer
129 views
Is GridSearchCV in combination with ImageDataGenerator possible and recommendable?
I want to optimize some hyperparameters for a CNN architecture by using GridSearchCV (Scikit-Learn) in combination with Data Augmentation (ImageDataGenerator from Keras).
However, GridSearchCV only ...
1
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1answer
42 views
Which combination of 3 hyperparameters to combat overfitting of a convolutional neural network?
I have a small dataset with which I want to train a CNN by using Data Augmentation. Since the CNN is overfitting due to the small data set, I would like to optimize some hyperparameters.
However, ...
0
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0answers
27 views
Why do I have leakage while using Stratified Group K Fold?
I have the following case:
Training data in the form of x, y coordinates on different frames (from a video). Based on this I computed some features, using only the training data and labels. A model ...
1
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3answers
321 views
How to combine GridSearchCV with Early Stopping?
I'm a beginner in machine learning and want to train a CNN (for image recognition) with optimized hyperparameter like dropout rate, learning rate and number of epochs.
The optimal hyperparameter I ...
1
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1answer
23 views
How to choose a model for this cross-validation curve?
I'm using GridSearchCV to tune hyperparameters for a Logistic Regression multiclass model.
I read on Kaggle that you should choose the hyperparameter that results in the lowest discrepancy between ...
0
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1answer
34 views
What to do after GridSearchCV()?
I happily created my first NN and performed hyperparameter optimization through GridSearchCV. I just don't know what to do next.
Do I have to fit it again with the ...
1
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2answers
98 views
Which scoring for GridSearchCV is best, when imbalanced multiclass dataset?
I have an unbalanced multiclass dataset (GTSRB) and want to optimize the hyperparameters of an SVM through GridSearchCV.
I know that accuracy is not suitable for scoring in this case.
Which evaluation ...
1
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1answer
18 views
How to print accuracy in each fold of Validation Dataset? and assign fold number to each row in the dataframe?
How to print the accuracy in each fold of a Validation Dataset ? And how can I assign the fold number to each row in the dataframe?
...
0
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1answer
134 views
How to choose the model parameters (RandomizedSearchCV, .GridSearchCV) or manually
Faced with the task of selecting parameters for the lightgbm model, the question accordingly arises, what is the best way to select them? I used the RandomizedSearchCV method, within 10 hours the ...
0
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1answer
35 views
CNN for subsets of a dataset - how to tune hyperparameters
I have a dataset and would like to train CNNs on subsets of different size of the dataset.
I already have a CNN, which classifies very well if I use the entire dataset.
Now the question arises if I ...
0
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1answer
78 views
sklearn.model_selection: GridSearchCV vs. KFold
Here is the explain of cv parameter in the sklearn.model_selection.GridSearchCV:
cv : int, cross-validation generator or an iterable, optional
Determines the cross-validation splitting ...
1
vote
1answer
46 views
Track underlying observation when using GridSearchCV and make_scorer
I'm doing a GridSearchCV, and I've defined a custom function (called custom_scorer below) to optimize for. So the setup is like this:
...
0
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0answers
29 views
GridSearch on imbalanced multi-class dataset
I have an imbalanced multi-class dataset (GTSRB) and would like to use GridSearch to determine the hyperparameters for an SVM. As metric for the evaluation I chose F1 with average macro.
...
0
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0answers
42 views
SVM - Shuffle image data before GridSearchCV or not?
I have different image datasets, most of them are sorted by class, others are already mixed.
For each of these data sets, I would like to train one SVM (in Python with Scikit-Learn), whereby in each ...
0
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0answers
19 views
Feature Engineering and Time calculation for grid search cv
I am new to data science and don't have model building experience.
I have a dataframe with 5000 rows and 10 columns.
The target column takes 1/0 as values.
One feature column is ZIP Code. I converted ...
4
votes
1answer
189 views
How to cache GridSearchCV optimizer result in Google Colab?
I have to execute GridSearchCV() cell every time I reload the page and it takes a lot of time. Is there a caching mechanism which stores the GridSearchCV result so ...
0
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1answer
118 views
CNNs - Hyperparameter tuning with different training sizes of the same data set
I would like to compare how much the classification performance (test accuracy) of CNNs changes depending on the size of the data set.
For this I would like to use a data set like MNIST or Fashion ...
1
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1answer
15 views
A doubt about the GridSearchCV function in Sklearn?
When creating different hyperparameter combinations, does the function evaluate combination 1 on the same fold as combination 2? As in, are the folds the same across combinations? I understand that ...
0
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1answer
1k views
GridSearchCV with MLPRegressor with Scikit learn
I'm trying to apply automatic fine tuning to a MLPRegressor with Scikit learn. After reading around, I decided to use GridSearchCV to choose the most suitable hyperparameters. Before that, I've ...
1
vote
2answers
492 views
Large negative R2 or accuracy scores for random forest with GridSearchCV but not train_test_split
I'm trying to use GridSearchCV from scikit-learn and look at the difference between train/test metrics.
When I do a normal test/train split with RandomForestRegressor, the metrics are comparable. ...
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1answer
162 views
0
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1answer
851 views
XGBOOST (sklearn interface) REGRESSION error
I am trying to run a GRIDSEARCHCV (sklearn) on XGBRegressor. Documentation on the parameter says that if regression, then objective = reg:squarederror.(see https://...
1
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2answers
461 views
Grid search model isn't recognized as fitted for Graphviz
I find this really weird, and the code is really straight forward.
What am I doing wrong ?
...
4
votes
1answer
1k views
What is GridSearchCV doing after it finishes evaluating the performance of parameter combinations that takes so long?
I'm running GridSearchCV to tune some parameters. For example:
...
1
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1answer
2k views
How to get mean test scores from GridSearchCV with multiple scorers - scikit-learn
I'm trying to get mean test scores from scikit-learn's GridSearchCV with multiple scorers.
grid.cv_results_ displays lots of ...
4
votes
4answers
556 views
Default parameters for decision trees give better results than parameters optimised using GridsearchCV
I am using Gridsearch for a DecisionTreeClassifier predicting a binary outcome. When I run fit and predict with default parameters, I get the following results:
...
0
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1answer
1k views
sklearn.GridSearchCV predict method not providing the best estimate and accuracy score
I was playing around with the credit default dataset in UCI
("https://archive.ics.uci.edu/ml/machine-learning-databases/00350/default%20of%20credit%20card%20clients.xls")
These are the steps i have ...
0
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1answer
2k views
Using GridSearchCV and a Random Forest Regressor with the same parameters gives different results
As the huge title says I'm trying to use GridSearchCV to find the best parameters for a Random Forest Regressor and I'm measuring my results with mse.
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3
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2answers
78 views
Overfitted model produces similar AUC on test set, so which model do I go with?
I was trying to compare the effect of running GridSearchCV on a dataset which was oversampled prior and oversampled after the training folds are selected. The oversampling approach I used was random ...
2
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1answer
2k views
GridSearchCV results are different to directly applied default model (SVM)
I run a Support Vector Machines model on part of my train set with following result:
...
2
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1answer
357 views
Sklearn Pipelines - How to carry over PCA?
I'm developing a pipeline to fit parameters for a gradient boosting classifier while also fitting the optimum number of features in a PCA model. This is the current setup:
...
2
votes
1answer
6k views
How to set class-weight for imbalanced classes in KerasClassifier while it is used inside the GridSearchCV?
Could you please let me know how to set class-weight for imbalanced classes in KerasClassifier while it is used inside the ...
