30 lines
818 B
Python
30 lines
818 B
Python
from __future__ import division
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from __future__ import print_function
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from graphsage.layers import Layer
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import tensorflow as tf
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flags = tf.app.flags
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FLAGS = flags.FLAGS
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"""
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Classes that are used to sample node neighborhoods
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"""
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class UniformNeighborSampler(Layer):
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"""
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Uniformly samples neighbors.
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Assumes that adj lists are padded with random re-sampling
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"""
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def __init__(self, adj_info, **kwargs):
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super(UniformNeighborSampler, self).__init__(**kwargs)
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self.adj_info = adj_info
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def _call(self, inputs):
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ids, num_samples = inputs
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adj_lists = tf.nn.embedding_lookup(self.adj_info, ids)
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adj_lists = tf.transpose(tf.random_shuffle(tf.transpose(adj_lists)))
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adj_lists = tf.slice(adj_lists, [0,0], [-1, num_samples])
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return adj_lists
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