How can I stop Rtabmap from publishing transform data on /tf topic?

edit

Hello, I am trying to implement slam on a mobile robot. I have created my own frames and linked them and I am publishing them on /tf I do not want rtabmap to publish its own transforms on this topic (I am using rtabmap only for visual odometry) I have a launch file as follows:

<launch>
  <!-- Convenience launch file to launch odometry, rtabmap and rtabmapviz nodes at once -->

  <!-- For stereo:=false
        Your RGB-D sensor should be already started with "depth_registration:=true".
        Examples:
           $ roslaunch freenect_launch freenect.launch depth_registration:=true 
           $ roslaunch openni2_launch openni2.launch depth_registration:=true -->

  <!-- For stereo:=true
        Your camera should be calibrated and publishing rectified left and right 
        images + corresponding camera_info msgs. You can use stereo_image_proc for image rectification.
        Example:
           $ roslaunch rtabmap_ros bumblebee.launch -->

  <!-- Choose between RGB-D and stereo -->      
  <arg name="stereo"          default="false"/>

  <!-- Choose visualization -->
  <arg name="rtabmapviz"              default="false" /> 
  <arg name="rviz"                    default="false" />

  <!-- Localization-only mode -->
  <arg name="localization"            default="false"/>

  <!-- Corresponding config files -->
  <arg name="cfg"                     default="" /> <!-- To change RTAB-Map's parameters, set the path of config file (*.ini) generated by the standalone app -->
  <arg name="gui_cfg"                 default="~/.ros/rtabmap_gui.ini" />
  <arg name="rviz_cfg"                default="$(find rtabmap_ros)/launch/config/rgbd.rviz" />

  <arg name="frame_id"                default="camera_link"/>     <!-- Fixed frame id, you may set "base_link" or "base_footprint" if they are published -->
  <arg name="namespace"               default="rtabmap"/>
  <arg name="database_path"           default="~/.ros/rtabmap.db"/>
  <arg name="queue_size"              default="10"/>
  <arg name="wait_for_transform"      default="0.2"/>
  <arg name="rtabmap_args"            default=""/>              <!-- delete_db_on_start, udebug -->
  <arg name="launch_prefix"           default=""/>              <!-- for debugging purpose, it fills launch-prefix tag of the nodes -->

  <!-- if timestamps of the input topics are synchronized using approximate or exact time policy-->
  <arg     if="$(arg stereo)" name="approx_sync"  default="false"/>
  <arg unless="$(arg stereo)" name="approx_sync"  default="true"/>         

  <!-- RGB-D related topics -->
  <arg name="rgb_topic"               default="/camera/rgb/image_rect_color" />
  <arg name="depth_topic"             default="/camera/depth_registered/image_raw" />
  <arg name="camera_info_topic"       default="/camera/rgb/camera_info" />

  <!-- stereo related topics -->
  <arg name="stereo_namespace"        default="/stereo_camera"/>
  <arg name="left_image_topic"        default="$(arg stereo_namespace)/left/image_rect_color" />
  <arg name="right_image_topic"       default="$(arg stereo_namespace)/right/image_rect" />      <!-- using grayscale image for efficiency -->
  <arg name="left_camera_info_topic"  default="$(arg stereo_namespace)/left/camera_info" />
  <arg name="right_camera_info_topic" default="$(arg stereo_namespace)/right/camera_info" />

  <arg name="compressed"              default="false"/>         <!-- If you want to subscribe to compressed image topics -->
  <arg name="rgb_image_transport"     default="compressed"/>    <!-- Common types: compressed, theora (see "rosrun image_transport list_transports") -->
  <arg name="depth_image_transport"   default="compressedDepth"/>  <!-- Common types: compressed, theora (see "rosrun image_transport list_transports") -->

  <arg name="subscribe_scan"          default="false"/>
  <arg name="scan_topic"              default="/scan"/>

  <arg name="subscribe_scan_cloud"    default="false"/>
  <arg name="scan_cloud_topic"        default="/scan_cloud"/>

  <arg name="visual_odometry"         default="true"/>          <!-- Launch rtabmap visual odometry node -->
  <arg name="odom_topic"              default="/odom"/>         <!-- Odometry topic used if visual_odometry is false -->
  <arg name="odom_frame_id"           default=""/>              <!-- If set, TF is used to get odometry instead of the topic -->
  <arg name="odom_args"               default="$(arg rtabmap_args)"/>

  <!-- These arguments should not be modified directly, see referred topics without "_relay" suffix above -->
  <arg if="$(arg compressed)"     name="rgb_topic_relay"           default="$(arg rgb_topic)_relay"/>
  <arg unless="$(arg compressed)" name="rgb_topic_relay"           default="$(arg rgb_topic)"/>
  <arg if="$(arg compressed)"     name="depth_topic_relay"         default="$(arg depth_topic ...