It draws samples from a truncated normal distribution centered on 0 with
stddev = sqrt(2 / fan_in) where fan_in is the number of input units in
the weight tensor.
initializer_he_normal(seed = NULL)Integer used to seed the random generator.
He et al., http://arxiv.org/abs/1502.01852
Other initializers: initializer_constant,
initializer_glorot_normal,
initializer_glorot_uniform,
initializer_he_uniform,
initializer_identity,
initializer_lecun_normal,
initializer_lecun_uniform,
initializer_ones,
initializer_orthogonal,
initializer_random_normal,
initializer_random_uniform,
initializer_truncated_normal,
initializer_variance_scaling,
initializer_zeros