Questions tagged [one-hot-encoding]

One-Hot Encoding is a method to encode categorical variables to numerical data that Machine Learning algorithms can deal with. One-Hot encoding is most used during feature engineering for a ML Model. It converts categorical values into a new categorical column and assign a binary value of 1 or 0 to those columns.

Also known as Dummy Encoding, One-Hot Encoding is a method to encode categorical variables, where no such ordinal relationship exists, to numerical data that Machine Learning algorithms can deal with. One hot encoding is the most widespread approach, and it works very well unless your categorical variable takes on a large number of unique values. One hot encoding creates new, binary columns, indicating the presence of each possible value from the original data. These columns store ones and zeros for each row, indicating the categorical value of that row.

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Using OneHotEncoder for categorical features in decision tree classifier

I am new to ML in Python and very confused by how to implement a decision tree with categorical variables as they get automatically encoded by party and ctree in R. I want to make a decision tree with two categorical independent features and one…
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Pandas get_dummies to create one hot with separator = ' ' and with character level separation

df = pd.DataFrame(["c", "b", "a p", NaN, "ap"]) df[0].str.get_dummies(' ') The above code prints something like this. a p b c ap 0 0 0 0 1 0 1 0 0 1 0 0 2 1 1 0 0 0 3 0 0 0 0 …
Kathiravan Natarajan
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return the labels and their encoded values in sklearn LabelEncoder

I'm using LabelEncoder and OneHotEncoder from sklearn in a Machine Learning project to encode the labels (country names) in the dataset. Everything works good and my model runs perfectly. The project is to classify whether a bank customer will…
BackSlash
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keras gridSearchCV on sklearn One hot Encoded Data

The problem with this code is that I am giving classifier, One hot encoded data: Means: X-train, X-test, y_train, y_test is one hot encoded. But the classifier is predicting the output: y_pred_test, y_pred_train in Numerical form (which I think…
Akhan
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How does this binary encoder function work?

I'm trying to understand the logic behind this binary encoder. It automatically takes categorical variables and dummy codes them (similar to one-hot-encoding on sklearn), but reduces the number of output columns equal to the log2 of the length of…
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One-hot encoding multiple columns of categorical variables at once

I have a Portugese bank data set that I got from the UCI Machine Learning Repository that is organized like so: > head(bank_data) age job marital education default housing loan contact month day_of_week duration …
zsad512
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Is there any way to visualize decision tree (sklearn) with categorical features consolidated from one hot encoded features?

Here is a link to a .csv file. This is a classic dataset that can be used to practice decision trees on! import pandas as pd import numpy as np import scipy as sc import scipy.stats from math import log import operator df =…
user8508347
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How to do pd.get_dummies or other ways?

Actually,My problem is based on the : Is there a faster way to update dataframe column values based on conditions? So,the data should be: import pandas as pd import io t=""" AV4MdG6Ihowv-SKBN_nB DTP,FOOD AV4Mc2vNhowv-SKBN_Rn Cash…
ileadall42
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How to one hot encode a large dataframe when multiple columns contain the same values?

The title essentially captures my problem. I have a dataframe and multiple columns have values such as [0,1] and if I were to go and one hot encode the df, I'd have multiple columns with the same name. The tedious solution would be to manually…
madsthaks
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one-hot encoding on multi-dimension arrays, using pandas or scikit-learn

I am trying to encode one-hot for my data frame. It is a multi dimension array and I am not sure how to do this. The data frame may look like this: df = pd.DataFrame({'menu': [['Italian', 'Greek'], ['Japanese'], ['Italian','Greek', 'Japanese']],…
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tflearn to_categorical: Processing data from pandas.df.values: array of arrays

labels = np.array([['positive'],['negative'],['negative'],['positive']]) # output from pandas is similar to the above values = (labels=='positive').astype(np.int_) to_categorical(values,2) Output: array([[ 1., 1.], [ 1., 1.], [ 1., …
Saravanabalagi Ramachandran
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encoding/factoring lists in pandas dataframe

I am attempting to encode lists of categories within a dataframe by factoring them. I will then be creating a matrix from this series of lists (normalizing them to a set length, creating a multidimensional array, and one-hot encoding the elements…
chase
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Vectorizing multi categorical data with pandas

Hej, I'm trying to vectorize items that can belong to multiple categories and put them into a pandas dataframe. I already came up with a solution but it's very slow. So here's what I'm doing: That's how my data looks like: data = { …
nadre
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How to one-hot-encode sentences at the character level?

I would like to convert a sentence to an array of one-hot vector. These vector would be the one-hot representation of the alphabet. It would look like the following: "hello" # h=7, e=4 l=11 o=14 would become [[0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,…
user6903745
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One-hot encoding of categories

I have a list like similar to this: list = ['Opinion, Journal, Editorial', 'Opinion, Magazine, Evidence-based', 'Evidence-based'] where the commas split between categories eg. Opinion and Journal are two separate categories. The…