code: def check_avail(self):
      if MultiTensorApply.available == False:
          raise RuntimeError(
              "Attempted to call MultiTensorApply method, but MultiTensorApply "
              "is not available, possibly because Apex was installed without "
              "--cpp_ext --cuda_ext.  Original import error message:",
              MultiTensorApply.import_err,
          )
  
imports: import torch
label_desc: Use image node_id 2 for calling the MultiTensorApply obj's underlying member method code with example usage: obj.check_avail() without return types