TensorFlow 1 version View source on GitHub

Assert the condition x < y holds element-wise.

    x, y, message=None, summarize=None, name=None

This Op checks that x[i] < y[i] holds for every pair of (possibly broadcast) elements of x and y. If both x and y are empty, this is trivially satisfied.

If x is not less than y element-wise, message, as well as the first summarize entries of x and y are printed, and InvalidArgumentError is raised.


  • x: Numeric Tensor.
  • y: Numeric Tensor, same dtype as and broadcastable to x.
  • message: A string to prefix to the default message.
  • summarize: Print this many entries of each tensor.
  • name: A name for this operation (optional). Defaults to "assert_less".


Op that raises InvalidArgumentError if x < y is False. This can be used with tf.control_dependencies inside of tf.functions to block followup computation until the check has executed.


  • InvalidArgumentError: if the check can be performed immediately and x < y is False. The check can be performed immediately during eager execution or if x and y are statically known.

Eager Compatibility

returns None