cdl2r 0.1.2

Combination Dependent Learning to Rank

# cdl2r
Combination Dependent Learning to Rank (組合せ依存型ランキング学習).

## requirements
- Python 3.6.x ~, 3.7.x ~

## dependencies
- NumPy
- Pandas

## installation
```shell
$ pip install cdl2r
```

## usage
### 1. prepare your dataset
The dataset format is like SVM-rank one.
The difference is `eid` must be specified in a line.
Here is a definition of a line.
`|` symbol means `OR` (so `<str>|<int>` means the value must have either str or int type).

```txt
<line> .=. <label> qid:<qid> eid:<eid> <features>#<comments>

<label> .=. <float>|<str as a class>
<qid> .=. <str>|<int>
<eid> .=. <str>|<int>
<features> .=. <dim>:<value>
<dim> .=. <0 or Natural Number>
<value> .=. <float>
<comments> .=. <Any text will do>
```

Let me show you an example.

```txt
0.5 qid:1 eid:x 1:0.1 2:-0.2 3:0.3#comment A
0.0 qid:1 eid:y 1:-0.1 2:0.2 4:0.4
-0.5 qid:1 eid:z 2:-0.2 3:0.3 4:-0.4#comment C
0.5 qid:2 eid:y 1:0.1 2:-0.2 3:0.3
0.0 qid:2 eid:z 1:-0.1 2:0.2 4:0.4
-0.5 qid:2 eid:w 2:-0.2 3:0.3 4:-0.4#comment E
```

### 2. loading your dataset
```python
from cdl2r.dataset import load_data

# loading dataset as a DataFrame object
data_path = '/path/to/dataset'
n_dimensions = 10
train = load_data(data_path, n_dimensions)
# train.columns
# >>> Index(['label', 'qid', 'eid', 'features'], dtype='object')
```

### 3. fitting the model
```python
from cdl2r.models import CDFMRegressor

# define your model
model = CDFMRegressor(n_factors=8, n_iterations=300, init_eta=1e-2)
# fitting, printing out epoch losses if verbose is True
model.fit(train, verbose=True)
```

### 4. save the model
```python
import pickle

with open('/path/to/file.pkl', mode='wb') as fp:
pickle.dump(model, fp)
```

### 5. make prediction
```python
# loading test dataset
test = load_data(test_path, n_dimensions)
pred = model.predict(test)
# pred.columns
# >>> Index(['pred_label', 'qid', 'eid', 'features'], dtype='object')
```

## development
### build Cython modules
```shell
$ python setup.py build_ext --inplace
```

### profiling
```shell
# decorate a method with `@profile` in a script where you want to profile.
$ kernprof -l -v <script>.py
```

### pylint
- max-line-length: 130
- disable snake-case

### release
```shell
# build
$ python setup.py bdist_whell

# testing upload
$ twine upload --repository testpypi dist/<cdl2r-version-pkg>
$ pip install --index-url https://test.pypi.org/simple/<cdl2r-version-pkg>

# upload
$ twine upload --repository pypi dist<cdl2r-version-pkg>
```