code: def force_float32_context() -> ContextManager:
      """Get context manager to force float32 precision in autocast mode."""
      if torch.is_autocast_enabled():
          return torch.cuda.amp.autocast(dtype=torch.float32)
      return nullcontext()
  
imports: import abc
  from contextlib import nullcontext
  from typing import ContextManager
  import torch
  import torch.nn.functional
  from nemo.core.classes.loss import Loss
  from nemo.core.utils.k2_guard import k2
label_desc: Use image node_id 1 for calling a global function with example usage: force_float32_context() and returns: nullcontext, torch