nd4j-backends/nd4j-api-parent/nd4j-api/src/main/java/org/nd4j/autodiff/samediff/SameDiff.java
public boolean allPlaceHolderVariablesResolved() {
        for (val vertexId : placeHolderVarNames) {
            val var = getVariable(vertexId);
            if (var.getArr() == null) {
                return false;
            }
        }

        return true;
    }
public boolean allPlaceHolderVariablesResolved() {
        for (val vertexId : placeHolderVarNames) {
            val var = getVariable(vertexId);
            if (var.getArr() == null) {
                return false;
            }
        }

        return true;
    }
Returns true if all place holder variables
are resolved.
A place holder variable is resolved when
{@link #getVariable(String)}
getArr() does not return null and
the shape is properly resolved.

@return true if all place holder variables are resolved.