add sympy support; which can transfer your network into sympy expression;

add visualize in genome;
add related tests.

tensorneat/utils/aggregation/agg_jnp.py

@@ -0,0 +1,70 @@
+import jax
+import jax.numpy as jnp
+
+
+class Agg:
+    @staticmethod
+    def name2func(name):
+        return getattr(Agg, name)
+
+    @staticmethod
+    def sum(z):
+        z = jnp.where(jnp.isnan(z), 0, z)
+        return jnp.sum(z, axis=0)
+
+    @staticmethod
+    def product(z):
+        z = jnp.where(jnp.isnan(z), 1, z)
+        return jnp.prod(z, axis=0)
+
+    @staticmethod
+    def max(z):
+        z = jnp.where(jnp.isnan(z), -jnp.inf, z)
+        return jnp.max(z, axis=0)
+
+    @staticmethod
+    def min(z):
+        z = jnp.where(jnp.isnan(z), jnp.inf, z)
+        return jnp.min(z, axis=0)
+
+    @staticmethod
+    def maxabs(z):
+        z = jnp.where(jnp.isnan(z), 0, z)
+        abs_z = jnp.abs(z)
+        max_abs_index = jnp.argmax(abs_z)
+        return z[max_abs_index]
+
+    @staticmethod
+    def median(z):
+        n = jnp.sum(~jnp.isnan(z), axis=0)
+
+        z = jnp.sort(z)  # sort
+
+        idx1, idx2 = (n - 1) // 2, n // 2
+        median = (z[idx1] + z[idx2]) / 2
+
+        return median
+
+    @staticmethod
+    def mean(z):
+        aux = jnp.where(jnp.isnan(z), 0, z)
+        valid_values_sum = jnp.sum(aux, axis=0)
+        valid_values_count = jnp.sum(~jnp.isnan(z), axis=0)
+        mean_without_zeros = valid_values_sum / valid_values_count
+        return mean_without_zeros
+
+
+AGG_ALL = (Agg.sum, Agg.product, Agg.max, Agg.min, Agg.maxabs, Agg.median, Agg.mean)
+
+
+def agg_func(idx, z, agg_funcs):
+    """
+    calculate activation function for inputs of node
+    """
+    idx = jnp.asarray(idx, dtype=jnp.int32)
+
+    return jax.lax.cond(
+        jnp.all(jnp.isnan(z)),
+        lambda: jnp.nan,  # all inputs are nan
+        lambda: jax.lax.switch(idx, agg_funcs, z),  # otherwise
+    )