Custom Activation Function for Keras

I'm currently working on a specialized project that requires a custom activation function in a Keras neural network. The primary data I'll be using for training is numerical.

Key Requirements:
- Custom Activation Function: Implementing a ReLU (Rectified Linear Unit) activation function in Keras.
- Specialized Project: The neural network will be tailored to solve a specific problem.
- Data Type: The primary type of data for training the network is numerical.

Ideal Freelancer:
- Proficient in Keras: Experienced in working with the Keras library.
- Custom Activation Functions: Skilled in implementing custom activation functions, particularly ReLU.
- Specialized Neural Networks: Previous experience in creating specialized neural networks for unique tasks.
- Data Handling: Capable of working with numerical data for machine learning applications.