function dropout$1(x, level, noiseShape, seed) {
	  return tidy(function () {
	    return dropout(x, level, noiseShape, seed);
	  });
	}
Sets entries in `x` to zero at random, while scaling the entire tensor.

@param x input tensor.
@param level fraction of the entries in the tensor that will be set to 0.
@param noiseShape shape of randomly generated keep/drop flags, must be
  broadcastable to the shape of `x`. Optional.
@param seed random seed to ensure determinism. Optional.
@returns Result of the dropout operation.