code: def parse_quantity(quantity):
      """
      Parse kubernetes canonical form quantity like 200Mi to a decimal number.
      Supported SI suffixes:
      base1024: Ki | Mi | Gi | Ti | Pi | Ei
      base1000: n | u | m | "" | k | M | G | T | P | E
  
      See
      https://github.com/kubernetes/apimachinery/blob/master/pkg/api/resource/quantity.go
  
      Input:
      quantity: string. kubernetes canonical form quantity
  
      Returns:
      Decimal
  
      Raises:
      ValueError on invalid or unknown input
      """
      if isinstance(quantity, (int, float, Decimal)):
          return Decimal(quantity)
  
      exponents = {
          "n": -3,
          "u": -2,
          "m": -1,
          "K": 1,
          "k": 1,
          "M": 2,
          "G": 3,
          "T": 4,
          "P": 5,
          "E": 6,
      }
  
      quantity = str(quantity)
      number = quantity
      suffix = None
      if len(quantity) >= 2 and quantity[-1] == "i":
          if quantity[-2] in exponents:
              number = quantity[:-2]
              suffix = quantity[-2:]
      elif len(quantity) >= 1 and quantity[-1] in exponents:
          number = quantity[:-1]
          suffix = quantity[-1:]
  
      try:
          number = Decimal(number)
      except InvalidOperation:
          raise ValueError("Invalid number format: {}".format(number))
  
      if suffix is None:
          return number
  
      if suffix.endswith("i"):
          base = 1024
      elif len(suffix) == 1:
          base = 1000
      else:
          raise ValueError("{} has unknown suffix".format(quantity))
  
      # handle SI inconsistency
      if suffix == "ki":
          raise ValueError("{} has unknown suffix".format(quantity))
  
      if suffix[0] not in exponents:
          raise ValueError("{} has unknown suffix".format(quantity))
  
      exponent = Decimal(exponents[suffix[0]])
      return number * (base**exponent)
  
label_desc: Use image node_id 1 for calling a global function with example usage: parse_quantity(quantity) and returns: unknown, Decimal, number