Function heGaussianInit
Creates a parameter initialiser that uses the method of He et al. (2015).
This technique initialises a parameter with samples from the following Gaussian distribution:
μ = 0 σ = sqrt(2 / fan_in)
For more details, see He et al. (2015): http://arxiv.org/abs/1502.01852
Returns
The constructed ParamInitiaizer
.