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Here are the steps to install h5py on MacOS with an M1 chip:

1. Open the Terminal application on your MacOS.

2. Type the following command and press enter to install "homebrew", a popular package manager for MacOS:

   /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
   

3. Once the installation is complete, type the following command and press enter to update brew:

   brew update
   

4. Next, type the following command and press enter to install HDF5:

   brew install hdf5
   

5. Once HDF5 is installed, type the following command and press enter to install h5py:

   pip install h5py
   

6. Verify that h5py is installed properly by typing the following command and pressing enter:

   python -c "import h5py; print(h5py.__version__)"
   

   This should print the version number of h5py installed on your computer.

That's it! h5py is now installed and ready to be used with Keras.