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29 lines
1.0 KiB
Python
29 lines
1.0 KiB
Python
1 year ago
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import tensorflow as tf
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# from tensorflow import Layer
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class Polymap(tf.keras.layers.Layer):
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def __init__(self, num_poly, poly_deg):
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super(Polymap, self).__init__()
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self.num_poly = num_poly
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self.poly_deg = poly_deg
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self.exponents = tf.constant(
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[range(self.poly_deg + 1), range(self.poly_deg + 1)], dtype=tf.float32)
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self.kernels = self.add_weight("kernels",
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shape=[
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self.num_poly, self.poly_deg + 1, self.poly_deg + 1],
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trainable=True)
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def build(self, input_shape):
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if input_shape[-1] != 2:
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raise "Input shape must be Ix2"
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def call(self, input):
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powers = tf.map_fn(
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lambda v: tf.pow(
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tf.repeat(tf.reshape(v, shape=(2, 1)),
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repeats=self.poly_deg + 1, axis=1),
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self.exponents), input)
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return tf.einsum("ik,ij,lkj->il", powers[:, 0], powers[:, 1], self.kernels)
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