tf.contrib.losses.mean_pairwise_squared_error(
predictions,
labels=None,
weights=1.0,
scope=None
)
Defined in tensorflow/contrib/losses/python/losses/loss_ops.py
.
Adds a pairwise-errors-squared loss to the training procedure. (deprecated)
Unlike mean_squared_error
, which is a measure of the differences between
corresponding elements of predictions
and labels
,
mean_pairwise_squared_error
is a measure of the differences between pairs of
corresponding elements of predictions
and labels
.
For example, if labels
=[a, b, c] and predictions
=[x, y, z], there are
three pairs of differences are summed to compute the loss:
loss = [ ((a-b) - (x-y)).^2 + ((a-c) - (x-z)).^2 + ((b-c) - (y-z)).^2 ] / 3
Note that since the inputs are of size [batch_size, d0, ... dN], the
corresponding pairs are computed within each batch sample but not across
samples within a batch. For example, if predictions
represents a batch of
16 grayscale images of dimension [batch_size, 100, 200], then the set of pairs
is drawn from each image, but not across images.
weights
acts as a coefficient for the loss. If a scalar is provided, then
the loss is simply scaled by the given value. If weights
is a tensor of size
[batch_size], then the total loss for each sample of the batch is rescaled
by the corresponding element in the weights
vector.
Args:
predictions
: The predicted outputs, a tensor of size [batch_size, d0, .. dN] where N+1 is the total number of dimensions inpredictions
.labels
: The ground truth output tensor, whose shape must match the shape of thepredictions
tensor.weights
: Coefficients for the loss a scalar, a tensor of shape [batch_size] or a tensor whose shape matchespredictions
.scope
: The scope for the operations performed in computing the loss.
Returns:
A scalar Tensor
representing the loss value.
Raises:
ValueError
: If the shape ofpredictions
doesn't match that oflabels
or if the shape ofweights
is invalid.