def start_assessment_run(assessmentTemplateArn=None, assessmentRunName=None):
    """
    Starts the assessment run specified by the ARN of the assessment template. For this API to function properly, you must not exceed the limit of running up to 500 concurrent agents per AWS account.
    See also: AWS API Documentation
    
    Examples
    Starts the assessment run specified by the ARN of the assessment template. For this API to function properly, you must not exceed the limit of running up to 500 concurrent agents per AWS account.
    Expected Output:
    
    :example: response = client.start_assessment_run(
        assessmentTemplateArn='string',
        assessmentRunName='string'
    )
    
    
    :type assessmentTemplateArn: string
    :param assessmentTemplateArn: [REQUIRED]
            The ARN of the assessment template of the assessment run that you want to start.
            

    :type assessmentRunName: string
    :param assessmentRunName: You can specify the name for the assessment run. The name must be unique for the assessment template whose ARN is used to start the assessment run.

    :rtype: dict
    :return: {
        'assessmentRunArn': 'string'
    }
    
    
    """
    pass
