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# How can Tensorflow be used to define feature columns in Python?

Tensorflow can be used to define feature columns for the estimator model by creating an empty list and accessing the ‘key’ values of the training dataset and iterating through it. During iteration, the feature names are appended to the empty list.

**Read More:**
What is TensorFlow and how Keras work with TensorFlow to create Neural Networks?

We will use the Keras Sequential API, which is helpful in building a sequential model that is used to work with a plain stack of layers, where every layer has exactly one input tensor and one output tensor.

A neural network that contains at least one layer is known as a convolutional layer. We can use the Convolutional Neural Network to build learning model.

TensorFlow Text contains collection of text related classes and ops that can be used with TensorFlow 2.0. The TensorFlow Text can be used to preprocess sequence modelling.

We are using the Google Colaboratory to run the below code. Google Colab or Colaboratory helps run Python code over the browser and requires zero configuration and free access to GPUs (Graphical Processing Units). Colaboratory has been built on top of Jupyter Notebook.

An Estimator is TensorFlow's high-level representation of a complete model. It is designed for easy scaling and asynchronous training.

## Example

print("Building list of feature columns for estimator model") my_feature_columns = [] for key in train.keys(): my_feature_columns.append(tf.feature_column.numeric_column(key=key))

Code credit −https://www.tensorflow.org/tutorials/estimator/premade#first_things_first

## Output

Building list of feature columns for estimator model

## Explanation

A feature column describes how the model should use raw input data from the features dictionary. When an Estimator model is built, a list of feature columns is passed to it.

They describe each of the features the model should use.

The tf.feature_column module gives many options to represent the data to the model.

We build a list of feature columns to tell Estimator model to represent each of the four features as 32-bit floating-point values.

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