code: def _load_single_patient_kallisto(self, patient):
          
          data = pd.read_csv(patient.tumor_sample.kallisto_path, sep="\t")
          data["patient_id"] = patient.id
          return data
docs: Load Kallisto gene quantification given a patient
  
          Parameters
          ----------
          patient : Patient
  
          Returns
          -------
          data: Pandas dataframe
              Pandas dataframe of sample's Kallisto data
              columns include patient_id, target_id, length, eff_length, est_counts, tpm