<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def update_pipe_module():
 """Populate the pipe module dynamically."""

    module_dir = __all__
    operators = stream.__dict__
    for key, value in operators.items():
        if getattr(value, 'pipe', None):
            globals()[key] = value.pipe
            if key not in module_dir:
                module_dir.append(key)