class_docstr: Represents a store of assets backed by metadata providers.
class_docstr_tok: ["Represents","a","store","of","assets","backed","by","metadata","providers","."]
code: def retrieve_card(self, name: str) -> AssetCard:
      if "@" in name:
          raise ValueError(
              "`name` must not contain the reserved '@' character."
          )
  
      envs = self._resolve_envs()
  
      return self._do_retrieve_card(name, envs)
  
imports: from __future__ import annotations
  import os
  from abc import ABC, abstractmethod
  from pathlib import Path
  from typing import Any, Dict, List, Optional, Protocol, final
  from fairseq2.assets.card import AssetCard, AssetCardError
  from fairseq2.assets.metadata_provider import AssetMetadataProvider, AssetNotFoundError, FileAssetMetadataProvider
  from fairseq2.assets.utils import _get_path_from_env
  from fairseq2.typing import finaloverride
label_desc: Use image node_id 2 for calling the ProviderBackedAssetStore obj's underlying member method code with example usage: obj.retrieve_card(name) and returns: self