遇到未知类别“2”。设置`add_nan=True`以允许未知类别pytorch_forecasting

Question

错误：“遇到了未知类别'2‘。将add_nan=True设置为允许未知类别”，同时在pytorch预测中创建时间序列数据集。

training = TimeSeriesDataSet(
train,
time_idx="index",
target=dni,
group_ids=["Solar Zenith Angle", "Relative Humidity","Dew 
Point","Temperature","Precipitable Water", "Wind Speed"],
min_encoder_length=max_encoder_length // 2,  # keep encoder length long (as it is in the 
validation set)
max_encoder_length=max_encoder_length,
min_prediction_length=1,
max_prediction_length=max_prediction_length,
static_reals=["Wind Direction"],
time_varying_known_reals=["index", "Solar Zenith Angle", "Relative Humidity","Dew 
Point","Temperature","Precipitable Water"],
#     time_varying_unknown_categoricals=[],
time_varying_unknown_reals=[dhi,dni,ghi],
categorical_encoders={data.columns[2]: NaNLabelEncoder(add_nan=True)},
target_normalizer=GroupNormalizer(
    groups=["Solar Zenith Angle", "Relative Humidity","Dew 
Point","Temperature","Precipitable Water", "Wind Speed"], transformation="softplus"
),  # use softplus and normalize by group
add_relative_time_idx=True,
add_target_scales=True,
add_encoder_length=True,

)

Answer 1

尝试添加pytorch_forecasting.data.encoders.NaNLabelEncoder(add_nan=True)，如本例所示：

max_prediction_length = 1
max_encoder_length = 27


training = TimeSeriesDataSet(
    sales_train,
    time_idx='dayofyear',
    target="QTT",
    group_ids=['S100','I100','C100','C101'],
    min_encoder_length=0,  
    max_encoder_length=max_encoder_length,
    min_prediction_length=1,
    max_prediction_length=max_prediction_length,
    static_categoricals=[],
    static_reals=['S100','I100','C100','C101'],
    time_varying_known_categoricals=[],  
    time_varying_known_reals=['DATE'],
    time_varying_unknown_categoricals=[],
    time_varying_unknown_reals=['DATE'],
    categorical_encoders={
        'S100': *pytorch_forecasting.data.encoders.NaNLabelEncoder(add_nan=True),*
        'I100':pytorch_forecasting.data.encoders.NaNLabelEncoder(add_nan=True),
        'C100':pytorch_forecasting.data.encoders.NaNLabelEncoder(add_nan=True),
        'C101':pytorch_forecasting.data.encoders.NaNLabelEncoder(add_nan=True)
    },
    add_relative_time_idx=True,
    add_target_scales=True,
    add_encoder_length=True,
    allow_missing_timesteps=True
   
    
)
print ('Executado')

Answer 2

数据集中的数字特性可能有一个字符串类型。当Pandas读取csv文件时，它将所有值视为字符串，除非定义了另一种类型。

在我的例子中，我忘记将目标变量转换为数字类型。在将变量的类型更改为np.float64后立即解决了这个问题。

我希望你觉得我的经验有用。