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cc75d6e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | # Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.
"""
Data models for the Container Yard Environment.
The Container Yard environment simulates a port container yard where containers
arrive sequentially and must be placed into stacks to minimize rehandles during
retrieval operations.
"""
from typing import List, Optional
from openenv.core.env_server.types import Action, Observation
from pydantic import Field
class Container:
"""Represents a single container with ID and priority."""
def __init__(self, container_id: int, priority: int):
self.container_id = container_id
priority_map = {1: 0, 2: 1, 3: 2} # 1=earliest (0), 3=latest (2)
self.retrieval_priority = priority_map.get(priority, 0)
def __repr__(self):
return f"C{self.container_id}(P{self.retrieval_priority})"
class ContainerYardAction(Action):
"""Action to place a container in a specific stack."""
stack_index: int = Field(..., description="Index of the stack to place container in (0-9)")
class ContainerYardObservation(Observation):
"""Observation of the current container yard state."""
stacks: List[List[int]] = Field(
default_factory=list,
description="Current state of stacks (container IDs, -1 means empty slot)"
)
containers_placed: int = Field(default=0, description="Number of containers placed so far")
total_containers: int = Field(default=0, description="Total containers in this episode")
current_container_id: int = Field(default=-1, description="ID of current container to place (-1 if done)")
current_container_priority: int = Field(default=0, description="Priority of current container (1-3)")
rehandles_so_far: int = Field(default=0, description="Total rehandles occurred so far")
num_stacks: int = Field(default=10, description="Number of stacks in the yard")
max_stack_height: int = Field(default=5, description="Maximum height of each stack")
action_error: Optional[str] = Field(default=None, description="Error message if last action failed")
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