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Added symmetry-breaking init in rbf #42

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Added symmetry-breaking init in rbf #42

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4 changes: 3 additions & 1 deletion jaxkern/stationary/rbf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -64,8 +64,10 @@ def __call__(
return K.squeeze()

def init_params(self, key: KeyArray) -> Dict:
eps = 1e-3
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Is there a reason for 1e-3. I’d personally like the jitter to be as small as possible.

random_jitter = jax.random.uniform(key, shape=[self.ndims], minval=-eps, maxval=eps)
params = {
"lengthscale": jnp.array([1.0] * self.ndims),
"lengthscale": jnp.array([1.0] * self.ndims) + random_jitter,
"variance": jnp.array([1.0]),
}
return jax.tree_util.tree_map(lambda x: jnp.atleast_1d(x), params)