public SDVariable logSigmoid(String name, SDVariable x) {
    SDValidation.validateNumerical("logSigmoid", "x", x);
    SDVariable out =  new org.nd4j.linalg.api.ops.impl.transforms.strict.LogSigmoid(sd,x).outputVariable();
    return sd.updateVariableNameAndReference(out, name);
  }