pytorch fp16からtorch.flort32に変える方法はありますか？

fp16からtorch.flort32に変えれば下のエラーが治ると思うのですが
調べてもnumpyからtorch　など違う物しかでてきません

fp16からtorch.flort32に変える方法がわかる人教えてください
もし変えても治らないなら　原因を教えてください

---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-1-00ebb105f79f> in <module>
    396             total_reward_vec = np.hstack((total_reward_vec[1:], episode_reward))  # 報酬を記録
    397             if batch_size<len(memory.buffer*4):
--> 398                 memory_TDerror.update_TDerror(gamma,multireward_steps)
    399                 for _ in range(t):
    400                     trin.pioritized_experience_replay(batch_size, gamma,step=episode,state_size=state_,action_size=acthon,multireward_steps=multireward_steps)

<ipython-input-1-00ebb105f79f> in update_TDerror(self, gamma, multireward_steps)
    294 
    295             next_state=memory.buffer[i][0]
--> 296             target = memory.buffer[i][2] + (gamma**multireward_steps) * targetQN.forward(next_state,"net_v")[0]
    297             self.buffer[i] =target - mainQN.forward(inpp,"net_q")[0]
    298 

<ipython-input-1-00ebb105f79f> in forward(self, inputs, net)
    188         if net=="net_v":
    189             V=self.V(x)-self.V_q(x)
--> 190             V=V.to("cpu")+0
    191             return V
    192         if net=="net_a":

~\Anaconda3\envs\pyflan\lib\site-packages\apex\amp\wrap.py in wrapper(*args, **kwargs)
     51 
     52         if len(types) <= 1:
---> 53             return orig_fn(*args, **kwargs)
     54         elif len(types) == 2 and types == set(['HalfTensor', 'FloatTensor']):
     55             new_args = utils.casted_args(cast_fn,

RuntimeError: "add_cpu/sub_cpu" not implemented for 'Half'