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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One Hot Encoding for words from a text corpus

How can I create one hot encoding of words with each word represented by a sparse vector of vocab size and the index of that particular word equated to 1 , using tensorflow ? something like oneHotEncoding(words = ['a','b','c','d']) ->…
Shadab Shaikh
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R DataFrame - One Hot Encoding of column containing multiple terms

I have a dataframe with a column having multiple values ( comma separated ): mydf <- structure(list(Age = c(99L, 10L, 40L, 15L), Info = c("good, bad, sad", "nice, happy, joy", "NULL", "okay, nice, fun, wild, go"), …
tuxdna
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Why is LabelEncoder is not reading the values?

I have trying to do 1-hot-encoding on a dataset using LabelEncoder and OneHotEncoder from sklearn by first LabelEncoding each column and then doing OneHotEncoding on the column. NOTE: I am purposefully making Row 1 of the dataframe for the two…
silent_dev
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OneHotEncoding Mapping

To discretize categorical features I'm using a LabelEncoder and OneHotEncoder. I know that LabelEncoder maps data alphabetically, but how does OneHotEncoder map data? I have a pandas dataframe, dataFeat with 5 different columns, and 4 possible…
gbhrea
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How could I do one hot encoding with multiple values in one cell?

I have this table in Excel: id class 0 2 3 1 1 3 2 3 5 Now, I want to do a 'special' one-hot encoding in Python. For each id in the first table, there are two numbers. Each number corresponds to a class (class1, class2, etc.). The second…
Feng Li
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adding one hot encoding throws error in previously working code in Tensorflow

with tf.variable_scope("rnn_seq2seq"): w = tf.get_variable("proj_w", [num_units, seq_width]) w_t = tf.transpose(w) b = tf.get_variable("proj_b", [seq_width]) output_projection=(w,b) output,state =…
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One Hot Encoding for representing corpus sentences in python

I am a starter in Python and Scikit-learn library. I currently need to work on a NLP project which firstly need to represent a large corpus by One-Hot Encoding. I have read Scikit-learn's documentations about the preprocessing.OneHotEncoder,…
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Random Forest predicting neither class when target is one hot encoded

I fairly know that trees are sensitive to one hot encoded (OHE) targets however I want to understand why it returns the predictions like this: array([[0, 0, 0, 0], [0, 0, 0, 0], . . . [0, 0, 0, 0], …
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How can I one-hot-encode multiple columns in R that share categories?

Say I have a dataframe with two columns like this: Label 1 Label 2 A B A C B C C A The values of A, B, and C in the first column are the same values of A, B, and C in the 2nd column. I want the encoding to look like…
user276238
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pandas/python : Get each distinct values of each column as columns and their counts as rows

I have a data frame like this with below code, df=pd.DataFrame(columns=['col1', 'col2', 'col3']) df.col1=['q1', 'q2', 'q2', 'q3', 'q4', 'q4'] df.col2=['b', 'a', 'a', 'c', 'b', 'b'] df.col3=['p', 'q', 'r', 'p', 'q', 'q'] df col1 col2 …
Kallol
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Keras CategoryEncoding layer with time sequences

For a LSTM, I create time sequences by means of tensorflow.keras.utils.timeseries_dataset_from_array(). For some of the features, I would like to do one-hot encoding by means of Keras preprocessing layers. I have the following code: n_timesteps =…
Requin
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How to implement feature importance on nominal categorical features in tree based classifiers?

I am using SKLearn XGBoost model for my binary classification problem. My data contains nominal categorical features (such as race) for which one hot encoding should be used to feed them to the tree based models. On the other hand, using…
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Why doesn't Keras one-hot encode have not zeroes?

For example: from tensorflow.keras.preprocessing.text import one_hot vocab_size = 5 one_hot('good job', vocab_size) Out[6]: [3, 2] For each word, it only assigns a single integer '3' and '2', not a vector of size 5 with 1 and 0s? Should one-hot…
marlon
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How to make dummy coding (pd.get_dummies()) only for categories which share in nominal variables is at least 40% in Python Pandas?

I have DataFrame like below: COL1 | COL2 | COL3 | ... | COLn -----|------|------|------|---- 111 | A | Y | ... | ... 222 | A | Y | ... | ... 333 | B | Z | ... | ... 444 | C | Z | ... | ... 555 | D | P | ... |…
dingaro
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Movies Dataset - Encoding variable that is a list of top four actors in that movie (R)

This is my dataset: when I filter for Actors column, I get a list of list (of 4 actors per movie) head(movies$Actors) [[1]] [1] "Rishab Shetty" " Sapthami Gowda" " Kishore Kumar G." [4] " Achyuth Kumar" [[2]] [1] "Christian Bale" " Heath…
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