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Updated Taxi-v2 to Taxi-v3 (map correction + cleaner domain description), fixes #1651 #1653

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Aug 23, 2019
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Updated Taxi-v2 to Taxi-v3 (map correction + cleaner domain description), fixes #1651 #1653

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32 changes: 19 additions & 13 deletions gym/envs/toy_text/taxi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@
MAP = [
"+---------+",
"|R: | : :G|",
"| : : : : |",
"| : | : : |",
"| : : : : |",
"| | : | : |",
"|Y| : |B: |",
Expand All @@ -23,12 +23,25 @@ class TaxiEnv(discrete.DiscreteEnv):
by Tom Dietterich

Description:
There are four designated locations in the grid world indicated by R(ed), B(lue), G(reen), and Y(ellow). When the episode starts, the taxi starts off at a random square and the passenger is at a random location. The taxi drive to the passenger's location, pick up the passenger, drive to the passenger's destination (another one of the four specified locations), and then drop off the passenger. Once the passenger is dropped off, the episode ends.
There are four designated locations in the grid world indicated by R(ed), G(reen), Y(ellow), and B(lue). When the episode starts, the taxi starts off at a random square and the passenger is at a random location. The taxi drives to the passenger's location, picks up the passenger, drives to the passenger's destination (another one of the four specified locations), and then drops off the passenger. Once the passenger is dropped off, the episode ends.

Observations:
There are 500 discrete states since there are 25 taxi positions, 5 possible locations of the passenger (including the case when the passenger is the taxi), and 4 destination locations.
There are 500 discrete states since there are 25 taxi positions, 5 possible locations of the passenger (including the case when the passenger is in the taxi), and 4 destination locations.

Passenger locations:
- 0: R(ed)
- 1: G(reen)
- 2: Y(ellow)
- 3: B(lue)
- 4: in taxi

Actions:
Destinations:
- 0: R(ed)
- 1: G(reen)
- 2: Y(ellow)
- 3: B(lue)

Actions:
There are 6 discrete deterministic actions:
- 0: move south
- 1: move north
Expand All @@ -46,15 +59,8 @@ class TaxiEnv(discrete.DiscreteEnv):
- magenta: destination
- yellow: empty taxi
- green: full taxi
- other letters (R, G, B and Y): locations for passengers and destinations

actions:
- 0: south
- 1: north
- 2: east
- 3: west
- 4: pickup
- 5: dropoff
- other letters (R, G, Y and B): locations for passengers and destinations


state space is represented by:
(taxi_row, taxi_col, passenger_location, destination)
Expand Down