67 lines
1.6 KiB
Python
67 lines
1.6 KiB
Python
import jax
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import jax.numpy as jnp
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class Agg:
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@staticmethod
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def name2func(name):
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return getattr(Agg, name)
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@staticmethod
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def sum(z):
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return jnp.sum(z, axis=0, where=~jnp.isnan(z), initial=0)
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@staticmethod
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def product(z):
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return jnp.prod(z, axis=0, where=~jnp.isnan(z), initial=1)
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@staticmethod
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def max(z):
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return jnp.max(z, axis=0, where=~jnp.isnan(z), initial=-jnp.inf)
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@staticmethod
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def min(z):
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return jnp.min(z, axis=0, where=~jnp.isnan(z), initial=jnp.inf)
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@staticmethod
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def maxabs(z):
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z = jnp.where(jnp.isnan(z), 0, z)
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abs_z = jnp.abs(z)
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max_abs_index = jnp.argmax(abs_z)
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return z[max_abs_index]
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@staticmethod
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def median(z):
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n = jnp.sum(~jnp.isnan(z), axis=0)
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z = jnp.sort(z) # sort
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idx1, idx2 = (n - 1) // 2, n // 2
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median = (z[idx1] + z[idx2]) / 2
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return median
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@staticmethod
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def mean(z):
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aux = jnp.where(jnp.isnan(z), 0, z)
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valid_values_sum = jnp.sum(aux, axis=0)
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valid_values_count = jnp.sum(~jnp.isnan(z), axis=0)
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mean_without_zeros = valid_values_sum / valid_values_count
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return mean_without_zeros
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AGG_ALL = (Agg.sum, Agg.product, Agg.max, Agg.min, Agg.maxabs, Agg.median, Agg.mean)
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def agg_func(idx, z, agg_funcs):
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"""
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calculate activation function for inputs of node
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"""
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idx = jnp.asarray(idx, dtype=jnp.int32)
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return jax.lax.cond(
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jnp.all(jnp.isnan(z)),
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lambda: jnp.nan, # all inputs are nan
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lambda: jax.lax.switch(idx, agg_funcs, z), # otherwise
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)
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