Thanks for your inputs, I will try that! For completion, here is how I retrieve the parameters:
` from trains import Task

task = Task.init("test", "test")
parent_task = Task.get_task(task.parent)
task.get_logger().report_text(task.get_parameters())
artifact_name = task.get_parameter("General/artifact_name")
artifact = parent_task.artifacts[artifact_name].get() `