You can optimize training time using mixed-precision training in TensorFlow by enabling the use of both 16-bit (half-precision) and 32-bit (full-precision) floating-point computations.
Here is the code you can refer to:
In the above code, we are using a Policy Setting that is 'mixed_float16', which sets computations to float16 while keeping variables in float32 to preserve numerical stability, loss Scaling, which automatically scales the loss to prevent underflow during backpropagation and Hardware requirements, which ensures your GPU supports Tensor Cores for maximum benefit.
Hence, this can significantly reduce training time while maintaining accuracy.