'keras.backend' is not a package

keras.backend is not a package in the C programming language. It seems like you may be referring to the keras library in Python, which does have a backend module. The keras.backend module provides low-level operations and functions for working with neural networks.

If you are looking for a similar functionality in C, you may need to use a different library or implement the functionality yourself. There are several popular libraries for deep learning in C, such as TensorFlow C API, Caffe, and Torch. These libraries provide high-level abstractions and functions for building and training neural networks.

If you need further assistance, please let me know.