nd4j-parameter-server-parent/nd4j-parameter-server-node/src/main/java/org/nd4j/parameterserver/distributed/messages/intercom/DistributedAssignMessage.java
@Override
    public void processMessage() {
        if (payload != null) {
            // we're assigning array
            if (storage.arrayExists(key) && storage.getArray(key).length() == payload.length())
                storage.getArray(key).assign(payload);
            else
                storage.setArray(key, payload);
        } else {
            // we're assigning number to row
            if (index >= 0) {
                if (storage.getArray(key) == null)
                    throw new RuntimeException("Init wasn't called before for key [" + key + "]");
                storage.getArray(key).getRow(index).assign(value);
            } else
                storage.getArray(key).assign(value);
        }
    }
@Override
    public void processMessage() {
        if (payload != null) {
            // we're assigning array
            if (storage.arrayExists(key) && storage.getArray(key).length() == payload.length())
                storage.getArray(key).assign(payload);
            else
                storage.setArray(key, payload);
        } else {
            // we're assigning number to row
            if (index >= 0) {
                if (storage.getArray(key) == null)
                    throw new RuntimeException("Init wasn't called before for key [" + key + "]");
                storage.getArray(key).getRow(index).assign(value);
            } else
                storage.getArray(key).assign(value);
        }
    }
This method assigns specific value to either specific row, or whole array.
Array is identified by key