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import time |
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from datetime import datetime, timedelta |
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import mysql.connector |
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from sympy import sympify |
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from multiprocessing import Pool |
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import random |
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import config |
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######################################################################################################################## |
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# PROCEDURES: |
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# Step 1: Query all virtual meters |
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# Step 2: Create multiprocessing pool to call worker in parallel |
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######################################################################################################################## |
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def calculate_hourly(logger): |
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while True: |
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# outer loop to reconnect server if there is a connection error |
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cnx_system_db = None |
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cursor_system_db = None |
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try: |
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cnx_system_db = mysql.connector.connect(**config.myems_system_db) |
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cursor_system_db = cnx_system_db.cursor() |
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except Exception as e: |
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logger.error("Error in step 0 of virtual_meter.calculate_hourly " + str(e)) |
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if cursor_system_db: |
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cursor_system_db.close() |
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if cnx_system_db: |
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cnx_system_db.close() |
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# sleep and continue the outer loop to reconnect the database |
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time.sleep(60) |
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continue |
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print("Connected to MyEMS System Database") |
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virtual_meter_list = list() |
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try: |
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cursor_system_db.execute(" SELECT m.id, m.name, e.equation, e.id as expression_id " |
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" FROM tbl_virtual_meters m, tbl_expressions e " |
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" WHERE m.id = e.virtual_meter_id " |
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" ORDER BY m.id ") |
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rows_virtual_meters = cursor_system_db.fetchall() |
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if rows_virtual_meters is None or len(rows_virtual_meters) == 0: |
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# sleep several minutes and continue the outer loop to reconnect the database |
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time.sleep(60) |
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continue |
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for row in rows_virtual_meters: |
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meta_result = {"id": row[0], "name": row[1], "equation": row[2], "expression_id": row[3]} |
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virtual_meter_list.append(meta_result) |
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except Exception as e: |
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logger.error("Error in step 1 of virtual meter calculate hourly " + str(e)) |
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# sleep and continue the outer loop to reconnect the database |
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time.sleep(60) |
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continue |
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finally: |
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if cursor_system_db: |
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cursor_system_db.close() |
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if cnx_system_db: |
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cnx_system_db.close() |
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# shuffle the virtual meter list for randomly calculating the meter hourly value |
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random.shuffle(virtual_meter_list) |
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print("Got all virtual meters in MyEMS System Database") |
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################################################################################################################ |
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# Step 2: Create multiprocessing pool to call worker in parallel |
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################################################################################################################ |
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p = Pool(processes=config.pool_size) |
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error_list = p.map(worker, virtual_meter_list) |
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p.close() |
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p.join() |
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for error in error_list: |
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if error is not None and len(error) > 0: |
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logger.error(error) |
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print("go to sleep ...") |
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time.sleep(60) |
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print("wake from sleep, and continue to work...") |
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######################################################################################################################## |
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# Step 1: get start datetime and end datetime |
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# Step 2: parse the expression and get all meters, virtual meters, offline meters associated with the expression |
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# Step 3: query energy consumption values from table meter hourly, virtual meter hourly and offline meter hourly |
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# Step 4: evaluate the equation with variables values from previous step and save to table virtual meter hourly |
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# returns the error string for logging or returns None |
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######################################################################################################################## |
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def worker(virtual_meter): |
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cnx_energy_db = None |
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cursor_energy_db = None |
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try: |
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cnx_energy_db = mysql.connector.connect(**config.myems_energy_db) |
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cursor_energy_db = cnx_energy_db.cursor() |
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except Exception as e: |
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if cursor_energy_db: |
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cursor_energy_db.close() |
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if cnx_energy_db: |
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cnx_energy_db.close() |
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return "Error in step 1.1 of virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'" |
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print("Start to process virtual meter: " + "'" + virtual_meter['name']+"'") |
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#################################################################################################################### |
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# step 1: get start datetime and end datetime |
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# get latest timestamp from energy database in tbl_virtual_meter_hourly |
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#################################################################################################################### |
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try: |
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query = (" SELECT MAX(start_datetime_utc) " |
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" FROM tbl_virtual_meter_hourly " |
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" WHERE virtual_meter_id = %s ") |
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cursor_energy_db.execute(query, (virtual_meter['id'],)) |
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row_datetime = cursor_energy_db.fetchone() |
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except Exception as e: |
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if cursor_energy_db: |
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cursor_energy_db.close() |
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if cnx_energy_db: |
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cnx_energy_db.close() |
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return "Error in step 1.2 of virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'" |
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start_datetime_utc = datetime.strptime(config.start_datetime_utc, '%Y-%m-%d %H:%M:%S') |
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start_datetime_utc = start_datetime_utc.replace(minute=0, second=0, microsecond=0, tzinfo=None) |
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if row_datetime is not None and len(row_datetime) > 0 and isinstance(row_datetime[0], datetime): |
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# replace second and microsecond with 0 |
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# note: do not replace minute in case of calculating in half hourly |
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start_datetime_utc = row_datetime[0].replace(second=0, microsecond=0, tzinfo=None) |
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# start from the next time slot |
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start_datetime_utc += timedelta(minutes=config.minutes_to_count) |
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end_datetime_utc = datetime.utcnow().replace() |
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end_datetime_utc = end_datetime_utc.replace(second=0, microsecond=0, tzinfo=None) |
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time_difference = end_datetime_utc - start_datetime_utc |
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time_difference_in_minutes = time_difference / timedelta(minutes=1) |
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if time_difference_in_minutes < config.minutes_to_count: |
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if cursor_energy_db: |
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cursor_energy_db.close() |
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if cnx_energy_db: |
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cnx_energy_db.close() |
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return "it's too early to calculate" + " for '" + virtual_meter['name'] + "'" |
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# trim end_datetime_utc |
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trimmed_end_datetime_utc = start_datetime_utc + timedelta(minutes=config.minutes_to_count) |
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while trimmed_end_datetime_utc <= end_datetime_utc: |
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trimmed_end_datetime_utc += timedelta(minutes=config.minutes_to_count) |
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end_datetime_utc = trimmed_end_datetime_utc - timedelta(minutes=config.minutes_to_count) |
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if end_datetime_utc <= start_datetime_utc: |
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if cursor_energy_db: |
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cursor_energy_db.close() |
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if cnx_energy_db: |
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cnx_energy_db.close() |
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return "it's too early to calculate" + " for '" + virtual_meter['name'] + "'" |
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print("start_datetime_utc: " + start_datetime_utc.isoformat()[0:19] |
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+ "end_datetime_utc: " + end_datetime_utc.isoformat()[0:19]) |
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############################################################################################################ |
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# Step 2: parse the expression and get all meters, virtual meters, and |
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# offline meters associated with the expression |
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############################################################################################################ |
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cnx_factory_db = None |
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cursor_factory_db = None |
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try: |
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cnx_factory_db = mysql.connector.connect(**config.myems_system_db) |
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cursor_factory_db = cnx_factory_db.cursor() |
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except Exception as e: |
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if cursor_factory_db: |
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cursor_factory_db.close() |
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if cnx_factory_db: |
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cnx_factory_db.close() |
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if cursor_energy_db: |
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cursor_energy_db.close() |
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if cnx_energy_db: |
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cnx_energy_db.close() |
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return "Error in step 2.1 of virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'" |
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meter_list_in_expression = list() |
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virtual_meter_list_in_expression = list() |
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offline_meter_list_in_expression = list() |
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try: |
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######################################################################################################## |
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# get all meters associated with the expression |
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######################################################################################################## |
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195
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cursor_factory_db.execute(" SELECT m.id as meter_id, v.name as variable_name " |
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" FROM tbl_meters m, tbl_variables v " |
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" WHERE m.id = v.meter_id " |
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" AND v.meter_type = 'meter' " |
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" AND v.expression_id = %s ", |
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(virtual_meter['expression_id'], )) |
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rows = cursor_factory_db.fetchall() |
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if rows is not None and len(rows) > 0: |
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for row in rows: |
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meter_list_in_expression.append({"meter_id": row[0], "variable_name": row[1].lower()}) |
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206
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######################################################################################################## |
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# get all virtual meters associated with the expression |
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######################################################################################################## |
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210
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cursor_factory_db.execute(" SELECT m.id as virtual_meter_id, v.name as variable_name " |
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" FROM tbl_virtual_meters m, tbl_variables v " |
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" WHERE m.id = v.meter_id " |
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" AND v.meter_type = 'virtual_meter' " |
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" AND v.expression_id = %s ", |
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(virtual_meter['expression_id'],)) |
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rows = cursor_factory_db.fetchall() |
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if rows is not None and len(rows) > 0: |
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for row in rows: |
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virtual_meter_list_in_expression.append({"virtual_meter_id": row[0], |
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"variable_name": row[1].lower()}) |
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######################################################################################################## |
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# get all offline meters associated with the expression |
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######################################################################################################## |
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226
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cursor_factory_db.execute(" SELECT m.id as offline_meter_id, v.name as variable_name " |
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" FROM tbl_offline_meters m, tbl_variables v " |
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" WHERE m.id = v.meter_id " |
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" AND v.meter_type = 'offline_meter' " |
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" AND v.expression_id = %s ", |
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(virtual_meter['expression_id'],)) |
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rows = cursor_factory_db.fetchall() |
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if rows is not None and len(rows) > 0: |
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for row in rows: |
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offline_meter_list_in_expression.append({"offline_meter_id": row[0], |
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"variable_name": row[1].lower()}) |
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except Exception as e: |
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if cursor_energy_db: |
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cursor_energy_db.close() |
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if cnx_energy_db: |
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cnx_energy_db.close() |
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return "Error in step 2.2 of virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'" |
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finally: |
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if cursor_factory_db: |
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cursor_factory_db.close() |
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if cnx_factory_db: |
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cnx_factory_db.close() |
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248
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249
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############################################################################################################ |
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250
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# Step 3: query energy consumption values from table meter hourly, virtual meter hourly |
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251
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# and offline meter hourly |
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252
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############################################################################################################ |
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253
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254
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print("getting energy consumption values from myems_energy_db.tbl_meter_hourly...") |
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255
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energy_meter_hourly = dict() |
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256
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if meter_list_in_expression is not None and len(meter_list_in_expression) > 0: |
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257
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try: |
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258
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for meter_in_expression in meter_list_in_expression: |
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meter_id = str(meter_in_expression['meter_id']) |
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query = (" SELECT start_datetime_utc, actual_value " |
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261
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" FROM tbl_meter_hourly " |
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262
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" WHERE meter_id = %s AND start_datetime_utc >= %s AND start_datetime_utc < %s " |
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263
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" ORDER BY start_datetime_utc ") |
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264
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cursor_energy_db.execute(query, (meter_id, start_datetime_utc, end_datetime_utc, )) |
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265
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rows_energy_values = cursor_energy_db.fetchall() |
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266
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if rows_energy_values is None or len(rows_energy_values) == 0: |
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267
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energy_meter_hourly[meter_id] = None |
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268
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else: |
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269
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energy_meter_hourly[meter_id] = dict() |
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270
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for row_energy_value in rows_energy_values: |
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271
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energy_meter_hourly[meter_id][row_energy_value[0]] = row_energy_value[1] |
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272
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except Exception as e: |
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273
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if cursor_energy_db: |
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274
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cursor_energy_db.close() |
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275
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if cnx_energy_db: |
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276
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cnx_energy_db.close() |
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277
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return "Error in step 3.2 virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'" |
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278
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279
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print("getting energy consumption values from myems_energy_db.tbl_virtual_meter_hourly...") |
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280
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energy_virtual_meter_hourly = dict() |
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281
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if virtual_meter_list_in_expression is not None and len(virtual_meter_list_in_expression) > 0: |
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282
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try: |
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283
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for virtual_meter_in_expression in virtual_meter_list_in_expression: |
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284
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virtual_meter_id = str(virtual_meter_in_expression['virtual_meter_id']) |
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285
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query = (" SELECT start_datetime_utc, actual_value " |
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286
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" FROM tbl_virtual_meter_hourly " |
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287
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" WHERE virtual_meter_id = %s " |
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288
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" AND start_datetime_utc >= %s AND start_datetime_utc < %s " |
|
289
|
|
|
" ORDER BY start_datetime_utc ") |
|
290
|
|
|
cursor_energy_db.execute(query, (virtual_meter_id, start_datetime_utc, end_datetime_utc,)) |
|
291
|
|
|
rows_energy_values = cursor_energy_db.fetchall() |
|
292
|
|
|
if rows_energy_values is None or len(rows_energy_values) == 0: |
|
293
|
|
|
energy_virtual_meter_hourly[virtual_meter_id] = None |
|
294
|
|
|
else: |
|
295
|
|
|
energy_virtual_meter_hourly[virtual_meter_id] = dict() |
|
296
|
|
|
for row_energy_value in rows_energy_values: |
|
297
|
|
|
energy_virtual_meter_hourly[virtual_meter_id][row_energy_value[0]] = row_energy_value[1] |
|
298
|
|
|
except Exception as e: |
|
299
|
|
|
if cursor_energy_db: |
|
300
|
|
|
cursor_energy_db.close() |
|
301
|
|
|
if cnx_energy_db: |
|
302
|
|
|
cnx_energy_db.close() |
|
303
|
|
|
return "Error in step 3.3 virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'" |
|
304
|
|
|
|
|
305
|
|
|
print("getting energy consumption values from myems_energy_db.tbl_offline_meter_hourly...") |
|
306
|
|
|
energy_offline_meter_hourly = dict() |
|
307
|
|
|
if offline_meter_list_in_expression is not None and len(offline_meter_list_in_expression) > 0: |
|
308
|
|
|
try: |
|
309
|
|
|
for offline_meter_in_expression in offline_meter_list_in_expression: |
|
310
|
|
|
offline_meter_id = str(offline_meter_in_expression['offline_meter_id']) |
|
311
|
|
|
query = (" SELECT start_datetime_utc, actual_value " |
|
312
|
|
|
" FROM tbl_offline_meter_hourly " |
|
313
|
|
|
" WHERE offline_meter_id = %s " |
|
314
|
|
|
" AND start_datetime_utc >= %s AND start_datetime_utc < %s " |
|
315
|
|
|
" ORDER BY start_datetime_utc ") |
|
316
|
|
|
cursor_energy_db.execute(query, (offline_meter_id, start_datetime_utc, end_datetime_utc,)) |
|
317
|
|
|
rows_energy_values = cursor_energy_db.fetchall() |
|
318
|
|
|
if rows_energy_values is None or len(rows_energy_values) == 0: |
|
319
|
|
|
energy_offline_meter_hourly[offline_meter_id] = None |
|
320
|
|
|
else: |
|
321
|
|
|
energy_offline_meter_hourly[offline_meter_id] = dict() |
|
322
|
|
|
for row_energy_value in rows_energy_values: |
|
323
|
|
|
energy_offline_meter_hourly[offline_meter_id][row_energy_value[0]] = row_energy_value[1] |
|
324
|
|
|
except Exception as e: |
|
325
|
|
|
if cursor_energy_db: |
|
326
|
|
|
cursor_energy_db.close() |
|
327
|
|
|
if cnx_energy_db: |
|
328
|
|
|
cnx_energy_db.close() |
|
329
|
|
|
return "Error in step 3.4 virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'" |
|
330
|
|
|
|
|
331
|
|
|
############################################################################################################ |
|
332
|
|
|
# Step 4: evaluate the equation with variables values from previous step |
|
333
|
|
|
# and save to table virtual meter hourly |
|
334
|
|
|
############################################################################################################ |
|
335
|
|
|
|
|
336
|
|
|
print("getting common time slot of energy values for all meters...") |
|
337
|
|
|
common_start_datetime_utc = start_datetime_utc |
|
338
|
|
|
common_end_datetime_utc = end_datetime_utc |
|
339
|
|
|
if energy_meter_hourly is not None and len(energy_meter_hourly) > 0: |
|
340
|
|
|
for meter_id, energy_hourly in energy_meter_hourly.items(): |
|
341
|
|
|
if energy_hourly is None or len(energy_hourly) == 0: |
|
342
|
|
|
common_start_datetime_utc = None |
|
343
|
|
|
common_end_datetime_utc = None |
|
344
|
|
|
break |
|
345
|
|
|
else: |
|
346
|
|
|
if common_start_datetime_utc < min(energy_hourly.keys()): |
|
347
|
|
|
common_start_datetime_utc = min(energy_hourly.keys()) |
|
348
|
|
|
if common_end_datetime_utc > max(energy_hourly.keys()): |
|
349
|
|
|
common_end_datetime_utc = max(energy_hourly.keys()) |
|
350
|
|
|
|
|
351
|
|
|
print("getting common time slot of energy values for all virtual meters...") |
|
352
|
|
View Code Duplication |
if common_start_datetime_utc is not None and common_start_datetime_utc is not None: |
|
|
|
|
|
|
353
|
|
|
if energy_virtual_meter_hourly is not None and len(energy_virtual_meter_hourly) > 0: |
|
354
|
|
|
for meter_id, energy_hourly in energy_virtual_meter_hourly.items(): |
|
355
|
|
|
if energy_hourly is None or len(energy_hourly) == 0: |
|
356
|
|
|
common_start_datetime_utc = None |
|
357
|
|
|
common_end_datetime_utc = None |
|
358
|
|
|
break |
|
359
|
|
|
else: |
|
360
|
|
|
if common_start_datetime_utc < min(energy_hourly.keys()): |
|
361
|
|
|
common_start_datetime_utc = min(energy_hourly.keys()) |
|
362
|
|
|
if common_end_datetime_utc > max(energy_hourly.keys()): |
|
363
|
|
|
common_end_datetime_utc = max(energy_hourly.keys()) |
|
364
|
|
|
|
|
365
|
|
|
print("getting common time slot of energy values for all offline meters...") |
|
366
|
|
View Code Duplication |
if common_start_datetime_utc is not None and common_start_datetime_utc is not None: |
|
|
|
|
|
|
367
|
|
|
if energy_offline_meter_hourly is not None and len(energy_offline_meter_hourly) > 0: |
|
368
|
|
|
for meter_id, energy_hourly in energy_offline_meter_hourly.items(): |
|
369
|
|
|
if energy_hourly is None or len(energy_hourly) == 0: |
|
370
|
|
|
common_start_datetime_utc = None |
|
371
|
|
|
common_end_datetime_utc = None |
|
372
|
|
|
break |
|
373
|
|
|
else: |
|
374
|
|
|
if common_start_datetime_utc < min(energy_hourly.keys()): |
|
375
|
|
|
common_start_datetime_utc = min(energy_hourly.keys()) |
|
376
|
|
|
if common_end_datetime_utc > max(energy_hourly.keys()): |
|
377
|
|
|
common_end_datetime_utc = max(energy_hourly.keys()) |
|
378
|
|
|
|
|
379
|
|
|
print("evaluating the equation with SymPy...") |
|
380
|
|
|
normalized_values = list() |
|
381
|
|
|
|
|
382
|
|
|
############################################################################################################ |
|
383
|
|
|
# Converting Strings to SymPy Expressions |
|
384
|
|
|
# The sympify function(that’s sympify, not to be confused with simplify) can be used to |
|
385
|
|
|
# convert strings into SymPy expressions. |
|
386
|
|
|
############################################################################################################ |
|
387
|
|
|
try: |
|
388
|
|
|
expr = sympify(virtual_meter['equation'].lower()) |
|
389
|
|
|
print("the expression to be evaluated: " + str(expr)) |
|
390
|
|
|
current_datetime_utc = common_start_datetime_utc |
|
391
|
|
|
print("common_start_datetime_utc: " + str(common_start_datetime_utc)) |
|
392
|
|
|
print("common_end_datetime_utc: " + str(common_end_datetime_utc)) |
|
393
|
|
|
while common_start_datetime_utc is not None \ |
|
394
|
|
|
and common_end_datetime_utc is not None \ |
|
395
|
|
|
and current_datetime_utc <= common_end_datetime_utc: |
|
396
|
|
|
meta_data = dict() |
|
397
|
|
|
meta_data['start_datetime_utc'] = current_datetime_utc |
|
398
|
|
|
|
|
399
|
|
|
#################################################################################################### |
|
400
|
|
|
# create a dictionary of Symbol: point pairs |
|
401
|
|
|
#################################################################################################### |
|
402
|
|
|
|
|
403
|
|
|
subs = dict() |
|
404
|
|
|
|
|
405
|
|
|
#################################################################################################### |
|
406
|
|
|
# Evaluating the expression at current_datetime_utc |
|
407
|
|
|
#################################################################################################### |
|
408
|
|
|
|
|
409
|
|
|
if meter_list_in_expression is not None and len(meter_list_in_expression) > 0: |
|
410
|
|
|
for meter_in_expression in meter_list_in_expression: |
|
411
|
|
|
meter_id = str(meter_in_expression['meter_id']) |
|
412
|
|
|
actual_value = energy_meter_hourly[meter_id].get(current_datetime_utc, 0.0) |
|
413
|
|
|
subs[meter_in_expression['variable_name']] = actual_value |
|
414
|
|
|
|
|
415
|
|
|
if virtual_meter_list_in_expression is not None and len(virtual_meter_list_in_expression) > 0: |
|
416
|
|
|
for virtual_meter_in_expression in virtual_meter_list_in_expression: |
|
417
|
|
|
virtual_meter_id = str(virtual_meter_in_expression['virtual_meter_id']) |
|
418
|
|
|
actual_value = energy_virtual_meter_hourly[virtual_meter_id].get(current_datetime_utc, 0.0) |
|
419
|
|
|
subs[virtual_meter_in_expression['variable_name']] = actual_value |
|
420
|
|
|
|
|
421
|
|
|
if offline_meter_list_in_expression is not None and len(offline_meter_list_in_expression) > 0: |
|
422
|
|
|
for offline_meter_in_expression in offline_meter_list_in_expression: |
|
423
|
|
|
offline_meter_id = str(offline_meter_in_expression['offline_meter_id']) |
|
424
|
|
|
actual_value = energy_offline_meter_hourly[offline_meter_id].get(current_datetime_utc, 0.0) |
|
425
|
|
|
subs[offline_meter_in_expression['variable_name']] = actual_value |
|
426
|
|
|
|
|
427
|
|
|
#################################################################################################### |
|
428
|
|
|
# To numerically evaluate an expression with a Symbol at a point, |
|
429
|
|
|
# we might use subs followed by evalf, |
|
430
|
|
|
# but it is more efficient and numerically stable to pass the substitution to evalf |
|
431
|
|
|
# using the subs flag, which takes a dictionary of Symbol: point pairs. |
|
432
|
|
|
#################################################################################################### |
|
433
|
|
|
|
|
434
|
|
|
meta_data['actual_value'] = expr.evalf(subs=subs) |
|
435
|
|
|
|
|
436
|
|
|
normalized_values.append(meta_data) |
|
437
|
|
|
|
|
438
|
|
|
current_datetime_utc += timedelta(minutes=config.minutes_to_count) |
|
439
|
|
|
|
|
440
|
|
|
except Exception as e: |
|
441
|
|
|
if cursor_energy_db: |
|
442
|
|
|
cursor_energy_db.close() |
|
443
|
|
|
if cnx_energy_db: |
|
444
|
|
|
cnx_energy_db.close() |
|
445
|
|
|
return "Error in step 4.1 virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'" |
|
446
|
|
|
|
|
447
|
|
|
print("saving energy values to table virtual meter hourly...") |
|
448
|
|
|
|
|
449
|
|
View Code Duplication |
if len(normalized_values) > 0: |
|
|
|
|
|
|
450
|
|
|
try: |
|
451
|
|
|
add_values = (" INSERT INTO tbl_virtual_meter_hourly " |
|
452
|
|
|
" (virtual_meter_id, start_datetime_utc, actual_value) " |
|
453
|
|
|
" VALUES ") |
|
454
|
|
|
|
|
455
|
|
|
for meta_data in normalized_values: |
|
456
|
|
|
add_values += " (" + str(virtual_meter['id']) + "," |
|
457
|
|
|
add_values += "'" + meta_data['start_datetime_utc'].isoformat()[0:19] + "'," |
|
458
|
|
|
add_values += str(meta_data['actual_value']) + "), " |
|
459
|
|
|
print("add_values:" + add_values) |
|
460
|
|
|
# trim ", " at the end of string and then execute |
|
461
|
|
|
cursor_energy_db.execute(add_values[:-2]) |
|
462
|
|
|
cnx_energy_db.commit() |
|
463
|
|
|
except Exception as e: |
|
464
|
|
|
if cursor_energy_db: |
|
465
|
|
|
cursor_energy_db.close() |
|
466
|
|
|
if cnx_energy_db: |
|
467
|
|
|
cnx_energy_db.close() |
|
468
|
|
|
return "Error in step 4.2 virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'" |
|
469
|
|
|
|
|
470
|
|
|
if cursor_energy_db: |
|
471
|
|
|
cursor_energy_db.close() |
|
472
|
|
|
if cnx_energy_db: |
|
473
|
|
|
cnx_energy_db.close() |
|
474
|
|
|
|
|
475
|
|
|
return None |
|
476
|
|
|
|
myems /
myems-normalization
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