code: def wallet_usd(exchange):
      return Wallet(exchange, 10000 * USD)
  
imports: import pytest
  import unittest.mock
  from tensortrade.core.base import Clock
  from tensortrade.oms.wallets import Wallet, Portfolio
  from tensortrade.oms.instruments import USD, BTC, ETH, XRP, BCH
label_desc: Use image node_id 2 for calling a global function with example usage: wallet_usd(exchange) and returns: Wallet