Implement some parts of main model structure

1. Configuration parsers
2. Model signature generator

2 files changed, 105 insertions, 3 deletions

diff --git a/models/__init__.py b/models/__init__.py
index e69de29..3b4d86e 100644
--- a/models/__init__.py
+++ b/models/__init__.py
@@ -0,0 +1 @@
+from .model import Model
diff --git a/models/model.py b/models/model.py
index cb0e756..ca1497f 100644
--- a/models/model.py
+++ b/models/model.py
@@ -1,15 +1,47 @@
-from typing import Union
+from typing import Union, Optional
 
 import torch
+from torch.utils.data import DataLoader
 from torch.utils.data.dataloader import default_collate
 
+from utils.configuration import DataloaderConfiguration, \
+    HyperparameterConfiguration, DatasetConfiguration, ModelConfiguration
+from utils.dataset import CASIAB
+from utils.sampler import TripletSampler
+
 
 class Model:
     def __init__(
             self,
-            batch_size: tuple[int, int]
+            model_config: ModelConfiguration,
+            hyperparameter_config: HyperparameterConfiguration
     ):
-        (self.pr, self.k) = batch_size
+        self.meta = model_config
+        self.hp = hyperparameter_config
+        self.curr_iter = self.meta['restore_iter']
+
+        self.is_train: bool = True
+        self.dataset_metadata: Optional[DatasetConfiguration] = None
+        self.pr: Optional[int] = None
+        self.k: Optional[int] = None
+
+        self._model_sig: str = self._make_signature(self.meta, ['restore_iter'])
+        self._hp_sig: str = self._make_signature(self.hp)
+        self._dataset_sig: str = 'undefined'
+
+    @property
+    def signature(self) -> str:
+        return '_'.join((self._model_sig, str(self.curr_iter), self._hp_sig,
+                         self._dataset_sig, str(self.batch_size)))
+
+    @property
+    def batch_size(self) -> int:
+        if self.is_train:
+            if self.pr and self.k:
+                return self.pr * self.k
+            raise AttributeError('No dataset loaded')
+        else:
+            return 1
 
     def _batch_splitter(
             self,
@@ -30,3 +62,72 @@ class Model:
                            default_collate(batch[i + self.k:i + self.k * 2])))
 
         return _batch
+
+    def fit(
+            self,
+            dataset_config: DatasetConfiguration,
+            dataloader_config: DataloaderConfiguration,
+    ):
+        self.is_train = True
+        dataset = self._parse_dataset_config(dataset_config)
+        dataloader = self._parse_dataloader_config(dataset, dataloader_config)
+        for iter_i, samples_batched in enumerate(dataloader):
+            for sub_i, (subject_c1, subject_c2) in enumerate(samples_batched):
+                pass
+
+                if sub_i == 0:
+                    break
+            if iter_i == 0:
+                break
+
+    def _parse_dataset_config(
+            self,
+            dataset_config: DatasetConfiguration
+    ) -> Union[CASIAB]:
+        self._dataset_sig = self._make_signature(
+            dataset_config,
+            popped_keys=['root_dir', 'cache_on']
+        )
+
+        config: dict = dataset_config.copy()
+        name = config.pop('name')
+        if name == 'CASIA-B':
+            return CASIAB(**config, is_train=self.is_train)
+        elif name == 'FVG':
+            # TODO
+            pass
+        raise ValueError('Invalid dataset: {0}'.format(name))
+
+    def _parse_dataloader_config(
+            self,
+            dataset: Union[CASIAB],
+            dataloader_config: DataloaderConfiguration
+    ) -> DataLoader:
+        config: dict = dataloader_config.copy()
+        if self.is_train:
+            (self.pr, self.k) = config.pop('batch_size')
+            triplet_sampler = TripletSampler(dataset, (self.pr, self.k))
+            return DataLoader(dataset,
+                              batch_sampler=triplet_sampler,
+                              collate_fn=self._batch_splitter,
+                              **config)
+        else:  # is_test
+            config.pop('batch_size')
+            return DataLoader(dataset, **config)
+
+    @staticmethod
+    def _make_signature(config: dict,
+                        popped_keys: Optional[list] = None) -> str:
+        _config = config.copy()
+        for (key, value) in config.items():
+            if popped_keys and key in popped_keys:
+                _config.pop(key)
+                continue
+            if isinstance(value, str):
+                pass
+            elif isinstance(value, (tuple, list)):
+                _config[key] = '_'.join([str(v) for v in value])
+            else:
+                _config[key] = str(value)
+
+        return '_'.join(_config.values())