Add rcdv and lending-club

[jiaqima]

Description

Refactor dataloader.py and LoadModel.py to accommodate the new datasets and models prepared by Caiwei.

Test

Running the following code will yield an accuracy with 1.0. Changing to data_name='lending-club' will yield an accuracy with 0.815.

data_name = 'rcdv'
import torch
from openxai.dataloader import return_loaders
loader_train, loader_test = return_loaders(data_name=data_name, download=True)
inputs, labels = iter(loader_test).next()

from openxai import LoadModel
model = LoadModel(data_name=data_name, ml_model='ann', pretrained=True)

prob = model(inputs.to(dtype=torch.float))
pred = torch.argmax(prob, dim=1)
accuracy = sum(pred == labels) / len(pred)