code: def is_fraud(self):
      index = np.random.choice(NUM_OF_ROWS)
      input_data = test_transactions[index : index + 1]
      self.client.post(endpoint, data=input_data.to_json())
  
imports: import numpy
  import pandas
  from locust import HttpUser
  from locust import between
  from locust import task
label_desc: Use image node_id 1 for calling the FraudDetectionUser obj's underlying member method code with example usage: obj.is_fraud() without return types