Float type slot is not working, just showing none

Hi, I want the bot to utter a value that is float type. I have set the slot as type float. But it’s always showing the value is none.

The complete is given here: nlu.yml:

  • intent: mood_great

    examples: |

    • perfect
    • great
    • amazing
    • feeling like a king
    • wonderful
    • I am feeling very good
    • I am great
    • I am amazing
    • I am going to save the world
    • super stoked
    • extremely good
    • so so perfect
    • so good
    • so perfect
  • intent: parameter_tuning_mu

    examples: |

    • Change the mutation rate parameter
    • Set the mutation rate parameter
    • I want to change the mutation rate parameter
    • Tune parameter by changing the mutation rate parameter
    • Run the algorithm with new mutation rate parameter
    • Take new value of mu rate parameter
    • change the value of mu rate parameter
    • I want to change the murate parameter
  • intent: new_parameter

    examples: |

    • 0.01
    • 0.05
    • 0.03
    • 0.02
    • parameter is 0.01
    • parameter is 0.05
    • It is 0.05

domain.yml: version: “3.1”

intents:

  • greet
  • goodbye
  • affirm
  • deny
  • mood_great
  • mood_unhappy
  • bot_challenge
  • parameter_tuning_mu
  • new_parameter
  • crossover_value_tuning

slots:

parameter:

type: float

min_value: 0.00

max_value: 1.00

mappings:

- type: custom

value:

type: float

min_value: 0.00

max_value: 1.00

mappings:

- type: custom

actions:

  • action_hello_world

responses:

utter_greet:

  • text: “Hey! How are you?”

utter_cheer_up:

utter_did_that_help:

  • text: “Did that help you?”

utter_happy:

  • text: “Great, carry on!”

utter_goodbye:

  • text: “Bye”

utter_ask_mutation_rate:

  • text: “What will be the next parameter?”

utter_ask_crossover_rate:

  • text: “What will be the next value?”

utter_next:

  • text: “ok, what is next?”

utter_iamabot:

  • text: “I am a bot, powered by Rasa.”

config: store_entities_as_slots: true

session_config: session_expiration_time: 60 carry_over_slots_to_new_session: true

stories.yml:

  • story: parameter tuning path

    steps:

    • intent: greet
    • action: utter_greet
    • intent: mood_great
    • action: utter_happy
    • intent: parameter_tuning_mu
    • action: utter_ask_mutation_rate
    • intent: new_parameter
    • action: action_hello_world
    • action: utter_next

from typing import Any, Text, Dict, List

from rasa_sdk.events import SlotSet

from rasa_sdk import Action, Tracker

from rasa_sdk.executor import CollectingDispatcher

class ActionHelloWorld(Action):

def name(self) -> Text:

     return "action_hello_world"

def run(self, dispatcher: CollectingDispatcher,

         tracker: Tracker,

         domain: Dict[Text, Any]) -> List[Dict[Text, Any]]:

    parameter = tracker.get_slot("parameter")

    if not parameter:

         dispatcher.utter_message(text="No mutation rate" )
    else:           
         dispatcher.utter_message(text="The mutation rate is {.2f% parameter}")

    return [SlotSet("parameter", parameter)]

Any help is highly appreciated.