Launching robot_localization with Python api [closed]

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I am using python to launch ROS nodes. I can launch the ekf_localization_node, but cannot seem to pass odom data to the node. In all the examples I have found, the parameters such as odom0, sensor_timeout etc. are set in the launch file within the node namespace. How do you do that in Python ? I am currently using the following script:

def load_params_from_yaml(yaml_file_path):
    from rosparam import upload_params
    from yaml import load
    f = open(yaml_file_path, 'r')
    yamlfile = load(f)
    f.close()
    upload_params('/ekf_localization_node', yamlfile)

But, my node cannot find the /odom data. I set the namespace to "/ekf_localization_node" - tried setting it " and '/' and neither of them worked. I can echo the rostopic /odom and see the odom data. I have the following YAML file:

frequency: 30
sensor_timeout: 2.0
two_d_mode: true
transform_time_offset: 0.0
transform_timeout: 0.0
print_diagnostics: true
debug: false 
map_frame: map              # Defaults to "map" if unspecified
odom_frame: odom            # Defaults to "odom" if unspecified
base_link_frame: base_link  # Defaults to "base_link" if unspecified
world_frame: odom           # Defaults to the value of odom_frame if unspecified
odom0: /odom
odom0_config: [true,  true,  false,
           false, false, false,
           false, false, false,
           false, false, true,
           false, false, false]
odom0_queue_size: 2
odom0_nodelay: false
odom0_differential: false
odom0_relative: false