# tf.contrib.legacy_seq2seq.sequence_loss

tf.contrib.legacy_seq2seq.sequence_loss(
logits,
targets,
weights,
average_across_timesteps=True,
average_across_batch=True,
softmax_loss_function=None,
name=None
)


Weighted cross-entropy loss for a sequence of logits, batch-collapsed.

#### Args:

• logits: List of 2D Tensors of shape [batch_size x num_decoder_symbols].
• targets: List of 1D batch-sized int32 Tensors of the same length as logits.
• weights: List of 1D batch-sized float-Tensors of the same length as logits.
• average_across_timesteps: If set, divide the returned cost by the total label weight.
• average_across_batch: If set, divide the returned cost by the batch size.
• softmax_loss_function: Function (labels, logits) -> loss-batch to be used instead of the standard softmax (the default if this is None). Note that to avoid confusion, it is required for the function to accept named arguments.
• name: Optional name for this operation, defaults to "sequence_loss".

#### Returns:

A scalar float Tensor: The average log-perplexity per symbol (weighted).

#### Raises:

• ValueError: If len(logits) is different from len(targets) or len(weights).