public INDArray firstIndex(INDArray in, Condition condition, long... dimensions) {
    NDValidation.validateNumerical("firstIndex", "in", in);
    Preconditions.checkArgument(dimensions.length >= 1, "dimensions has incorrect size/length. Expected: dimensions.length >= 1, got %s", dimensions.length);
    return Nd4j.exec(new org.nd4j.linalg.api.ops.impl.indexaccum.FirstIndex(in, false, condition, dimensions));
  }