def make_report(self, data):
res = self.connect(data)
exprs = AttrDict(loss=self._loss(data, res))
exprs.update(self._report(data, res))
for k, v in exprs.items():
if not isinstance(v, tf.Tensor):
exprs[k] = tf.convert_to_tensor(v)
return exprs
def _build(self, h, x, presence=None):
"""Builds the module.
Args:
h: Tensor of encodings of shape [B, n_enc_dims].
x: Tensor of inputs of shape [B, n_points, n_input_dims]
presence: Tensor of shape [B, n_points, 1] or None; if it exists, it
indicates which input points exist.
Returns:
A bunch of stuff.
"""
batch_size, n_input_points, _ = x.shape.as_list()
res = AttrDict(
dynamic_weights_l2=tf.constant(0.)
)
output_shapes = (
[1], # per-capsule presence
[self._n_votes], # per-vote-presence
[self._n_votes], # per-vote scale
[self._n_votes, self._n_caps_dims]
)
splits = [np.prod(i).astype(np.int32) for i in output_shapes]
n_outputs = sum(splits)
batch_mlp = neural.BatchMLP([self._n_hiddens, self._n_hiddens, n_outputs],
use_bias=True)
all_params = batch_mlp(h)
all_params = tf.split(all_params, splits, -1)
batch_shape = [batch_size, self._n_caps]
all_params = [tf.reshape(i, batch_shape + s)
for (i, s) in zip(all_params, output_shapes)]
def add_noise(tensor):
return tf.random.uniform(tensor.shape, minval=-.5, maxval=.5) * 4.
res.pres_logit_per_caps = add_noise(all_params[0])
res.pres_logit_per_vote = add_noise(all_params[1])
res.scale = tf.nn.softplus(all_params[2] + .5) + 1e-6
res.vote_presence = (tf.nn.sigmoid(res.pres_logit_per_caps)
* tf.nn.sigmoid(res.pres_logit_per_vote))
res.vote = all_params[3]
for k, v in res.items():
if v.shape.ndims > 0:
res[k] = snt.MergeDims(1, 2)(v)
likelihood = _capsule.OrderInvariantCapsuleLikelihood(self._n_votes,
res.vote, res.scale,
res.vote_presence)
ll_res = likelihood(x, presence)
res.update(ll_res._asdict())
# post processing
mixing_probs = tf.nn.softmax(ll_res.mixing_logits, 1)
prior_mixing_log_prob = tf.log(1. / n_input_points)
mixing_kl = mixing_probs * (ll_res.mixing_log_prob - prior_mixing_log_prob)
mixing_kl = tf.reduce_mean(tf.reduce_sum(mixing_kl, -1))
wins_per_caps = tf.one_hot(ll_res.is_from_capsule, depth=self._n_caps)
if presence is not None:
wins_per_caps *= tf.expand_dims(presence, -1)
wins_per_caps = tf.reduce_sum(wins_per_caps, 1)
has_any_wins = tf.to_float(tf.greater(wins_per_caps, 0))
should_be_active = tf.to_float(tf.greater(wins_per_caps, 1))
sparsity_loss = tf.nn.sigmoid_cross_entropy_with_logits(
labels=should_be_active, logits=res.pres_logit_per_caps)
sparsity_loss = tf.reduce_sum(sparsity_loss * has_any_wins, -1)
sparsity_loss = tf.reduce_mean(sparsity_loss)
caps_presence_prob = tf.reduce_max(
tf.reshape(res.vote_presence,
[batch_size, self._n_caps, self._n_votes]), 2)
res.update(dict(
mixing_kl=mixing_kl,
sparsity_loss=sparsity_loss,
caps_presence_prob=caps_presence_prob,
mean_scale=tf.reduce_mean(res.scale)
))
return res
