如何在pytorch中将字符串列表转换为张量？

Question

我正在使用 phytorch 制作和预测几个模型。因为内存问题，我把张量列表做成了数据框，保存为Excel。之后，我尝试通过加载存储在Excel中的数据来预测模型，但是当我调用Excel时，张量列表变成了一个str列表。如何将此 str 列表更改回张量列表？我将参考部分代码，原始张量。

def BERT_reasoning(tokens_tensor, segments_tensors):
    model.eval()
    predictions=[]
    for i in range(len(tokens_tensor)):
        if torch.cuda.is_available():
            tokens_tensor[i] = tokens_tensor[i].to('cuda')
            segments_tensors[i] = segments_tensors[i].to('cuda')
            model.to('cuda')
            with torch.no_grad():
                outputs = model(tokens_tensor[i], token_type_ids=segments_tensors[i])
                predictions.append(outputs[0])
                torch.cuda.empty_cache()
    return(predictions)


predictions=[0 for i in range(len(target))]
for i in tqdm(range(len(target))):
    predictions[0]=BERT_reasoning(tokens_tensor[i],segments_tensors[i])
    globals()['df_pred_{}'.format(i)]=pd.DataFrame(predictions[0])
    del predictions[0]
    excel_name='prediction_{}.xlsx'.format(i)
    globals()['df_pred_{}'.format(i)].to_excel(excel_name)
    del globals()['df_pred_{}'.format(i)]
    torch.cuda.empty_cache()



Result :
orginal tensor -
tensor([[[ -7.2395,  -7.2337,  -7.2301,  ...,  -6.6463,  -6.5081,  -4.4686],
         [ -8.1057,  -8.1946,  -8.0791,  ...,  -8.4518,  -7.6345,  -5.3930],
         [-10.7883, -10.6919, -10.5438,  ...,  -9.9607, -10.0536,  -6.8828],
         ...,
         [ -9.0698,  -9.3295,  -8.9949,  ...,  -6.1696,  -7.4357,  -7.4828],
         [ -6.3161,  -6.4182,  -6.5455,  ...,  -5.5366,  -5.7362,  -2.2207],
         [-12.0209, -11.9511, -12.0039,  ..., -11.8723,  -9.6545,  -8.2306]]],
       device='cuda:0')

changed str
"tensor([[[ -7.2395,  -7.2337,  -7.2301,  ...,  -6.6463,  -6.5081,  -4.4686],\n         [ -8.1057,  -8.1946,  -8.0791,  ...,  -8.4518,  -7.6345,  -5.3930],\n         [-10.7883, -10.6919, -10.5438,  ...,  -9.9607, -10.0536,  -6.8828],\n         ...,\n         [ -9.0698,  -9.3295,  -8.9949,  ...,  -6.1696,  -7.4357,  -7.4828],\n         [ -6.3161,  -6.4182,  -6.5455,  ...,  -5.5366,  -5.7362,  -2.2207],\n         [-12.0209, -11.9511, -12.0039,  ..., -11.8723,  -9.6545,  -8.2306]]],\n       device='cuda:0')"

Answer 1

您可以使用内置eval函数从字符串中获取张量。请注意，您的张量不应包含省略号（即“...”），因为张量不会被明确定义。所有值都应出现在您希望恢复的字符串中（否则，无法确定它们应该是什么）。例子：

t = eval("tensor([[1,2,3],[4,5,6]], device='cuda:0')")