Added Dataloader

teng-ml/main.py

@@ -1,6 +1,3 @@
-import matplotlib.pyplot as plt
-import pandas as pd
-
 if __name__ == "__main__":
     if __package__ is None:
         # make relative imports work as described here: https://peps.python.org/pep-0366/#proposed-change
@@ -10,10 +7,18 @@ if __name__ == "__main__":
         filepath = path.realpath(path.abspath(__file__))
         sys.path.insert(0, path.dirname(path.dirname(filepath)))
 
-from .util.transform import ConstantInterval
+import matplotlib.pyplot as plt
+import pandas as pd
+import torch
+import torch.nn as nn
+from torch.utils.data import DataLoader
 
-if __name__ == "__main__":
+
-    file = "/home/matth/data/2023-04-25_kapton_8.2V_179mm002.csv"
+from .util.transform import ConstantInterval
+from .util.data_loader import load_datasets, LabelConverter
+
+def test_interpol():
+    file = "/home/matth/data/2023-04-27_glass_8.2V_179mm000.csv"
     # file = "/home/matth/data/test001.csv"
     df = pd.read_csv(file)
     array = df.to_numpy()
@@ -27,3 +32,104 @@ if __name__ == "__main__":
     ax1.legend()
     plt.show()
 
+if __name__ == "__main__":
+    device = (
+        "cuda"
+        if torch.cuda.is_available()
+        else "mps"
+        if torch.backends.mps.is_available()
+        else "cpu"
+    )
+    print(f"Using device: {device}")
+
+    labels = LabelConverter(["foam", "glass", "kapton", "foil"])
+    train_set, test_set = load_datasets("/home/matth/data", labels, voltage=8.2)
+
+    # train_loader = iter(DataLoader(train_set))
+    # test_loader = iter(DataLoader(test_set))
+    # sample = next(train_loader)
+    # print(sample)
+    train_loader = iter(DataLoader(train_set))
+    test_loader = iter(DataLoader(test_set))
+    class RNN(nn.Module):
+        def __init__(self, input_size, hidden_size, num_layers, num_classes, if_bidirectional):
+            super(RNN, self).__init__()
+            self.num_layers = num_layers
+            self.hidden_size = hidden_size
+            self.if_bidirectional = if_bidirectional
+            self.lstm = nn.LSTM(input_size, hidden_size, num_layers, batch_first=True, bidirectional=if_bidirectional)
+
+            if if_bidirectional == True:
+              self.fc = nn.Linear(hidden_size * 2, num_classes)
+            else:
+              self.fc = nn.Linear(hidden_size, num_classes)
+
+
+        def forward(self, x):
+            D = 2 if self.if_bidirectional == True else 1
+            Batch = x.batch_sizes[0]
+
+            h0 = torch.zeros(D * self.num_layers, Batch, self.hidden_size).to(device)
+            c0 = torch.zeros(D * self.num_layers, Batch, self.hidden_size).to(device)
+            x.to(device)
+            _, (h_n, _) = self.lstm(x, (h0, c0))
+            final_state  = h_n.view(self.num_layers, D, Batch, self.hidden_size)[-1]     # num_layers, num_directions, batch, hidden_size
+
+            if D == 1:
+              X = final_state.squeeze()
+            elif D == 2:
+              h_1, h_2 = final_state[0], final_state[1]  # forward & backward pass
+              #X = h_1 + h_2                # Add both states
+              X = torch.cat((h_1, h_2), 1)         # Concatenate both states, X-size: (Batch, hidden_size * 2）
+
+            output = self.fc(X) # fully-connected layer
+
+            return output
+
+    model = RNN(input_size = 1, hidden_size = 8, num_layers = 3, num_classes = 18, if_bidirectional = True).to(device)
+    loss_func = torch.nn.CrossEntropyLoss()
+    optimizer = torch.optim.Adam(model.parameters(), lr=0.02)
+    scheduler = torch.optim.lr_scheduler.ExponentialLR(optimizer, gamma=0.95)
+
+    print(model)
+
+# training 
+    for ep in range(40):
+        train_correct = 0
+        train_total = 0
+        val_correct = 0
+        val_total = 0
+        for (x, y), length in train_loader: 
+            batch_size = x.shape[0]
+            v = x.view(batch_size, -1, nFeatrue)
+            data = rnn_utils.pack_padded_sequence(v.type(torch.FloatTensor), length, batch_first=True).to(device)
+            # print(data.batch_sizes[0])
+            # print(data)
+            out = model(data)
+            loss = loss_func(out, y) 
+            # print(loss)
+
+            optimizer.zero_grad()   # clear gradients for next train
+            loss.backward()         # backpropagation, compute gradients
+            optimizer.step()        # apply gradients
+            
+            predicted = torch.max(torch.nn.functional.softmax(out), 1)[1]
+            train_total += y.size(0)
+            train_correct += (predicted == y).sum().item()
+
+
+        scheduler.step()
+        
+        for (x, y), length in test_loader: 
+            batch_size = x.shape[0]
+            v = x.view(batch_size, -1, nFeatrue)
+            data = rnn_utils.pack_padded_sequence(v.type(torch.FloatTensor), length, batch_first=True).to(device)
+            out = model(data)
+            loss = loss_func(out, y)     
+            
+            predicted = torch.max(torch.nn.functional.softmax(out), 1)[1]
+            val_total += y.size(0)
+            val_correct += (predicted == y).sum().item()
+
+        print("epoch: ", ep + 1, 'Accuracy of the Train: %.2f %%' % (100 * train_correct / train_total), 'Accuracy of the Test: %.2f %%' % (100 * val_correct / val_total))
+

teng-ml/util/data_loader.py

@@ -1,25 +1,95 @@
 
-def load_data():
+from os import path, listdir
-    # Build the category_lines dictionary, a list of names per language
+import re
-    category_lines = {}
+import numpy as np
-    all_categories = []
+import pandas as pd
 
-    def find_files(path):
+from sklearn.model_selection import train_test_split
-        return glob.glob(path)
 
-    # Read a file and split into lines
+# groups: date, name, voltage, distance, index
-    def read_lines(filename):
+re_filename = r"(\d{4}-\d{2}-\d{2})_([a-zA-Z]+)_(\d{1,2}(?:\.\d*)?)V_(\d+(?:\.\d*)?)mm(\d+).csv"
-        lines = io.open(filename, encoding='utf-8').read().strip().split('\n')
-        return [unicode_to_ascii(line) for line in lines]
 
-    for filename in find_files('data/names/*.txt'):
+class LabelConverter:
-        category = os.path.splitext(os.path.basename(filename))[0]
+    def __init__(self, class_labels):
-        all_categories.append(category)
+        self.class_labels = class_labels.copy()
+        self.class_labels.sort()
 
-        lines = read_lines(filename)
+    def get_one_hot(self, label):
-        category_lines[category] = lines
+        """return one hot vector for given label"""
+        vec = np.zeros(len(self.class_labels), dtype=np.float32)
+        vec[self.class_labels.index(label)] = 1.0
+        return vec
 
-    return category_lines, all_categories
+    def __getitem__(self, index):
+        return self.class_labels[index]
+
+    def __contains__(self, value):
+        return value in self.class_labels
+
+    def get_labels(self):
+        return self.class_labels.copy()
 
 
 
+class Datasample:
+    def __init__(self, date: str, label: str, voltage: str, distance: str, index: str, label_vec, datapath: str):
+        self.date = date
+        self.label = label
+        self.voltage = float(voltage)
+        self.distance = float(distance)
+        self.index = int(index)
+        self.label_vec = label_vec
+        self.datapath = datapath
+        self.data = None
+
+    def __repr__(self):
+        size = self.data.size if self.data else "Unknown"
+        return f"{self.label}-{self.index}: dimension={size}, recorded at {self.date} with U={self.voltage}V, d={self.distance}mm"
+
+    def _load_data(self):
+        df = pd.read_csv(self.datapath)
+        self.data = df.to_numpy()
+
+    def get_data(self):
+        """[[timestamps, idata, vdata]]"""
+        if not self.data:
+            self._load_data()
+        return self.data
+
+class Dataset:
+    """
+    Store the whole dataset, compatible with torch.data.Dataloader
+    """
+    def __init__(self, datasamples):
+        self.datasamples = datasamples
+        # self.labels = [ d.label_vec for d in datasamples ]
+        # self.data = [ d.get_data() for d in datasamples ]
+
+    def __getitem__(self, index):
+        return self.datasamples[index].get_data(), self.datasamples[index].label_vec
+
+    def __len__(self):
+        return len(self.datasamples)
+
+def load_datasets(datadir, labels: LabelConverter, voltage=None, train_to_test_ratio=0.7, random_state=None):
+    """
+    load all data from datadir that are in the format: yyyy-mm-dd_label_x.xV_xxxmm.csv
+    """
+    datasamples = []
+    files = listdir(datadir)
+    files.sort()
+    for file in files:
+        match = re.fullmatch(re_filename, file)
+        if not match: continue
+
+        label = match.groups()[1]
+        if label not in labels: continue
+
+        sample_voltage = float(match.groups()[2])
+        if voltage and voltage != sample_voltage: continue
+
+        datasamples.append(Datasample(*match.groups(), labels.get_one_hot(label), datadir + "/" + file))
+    train_samples, test_samples = train_test_split(datasamples, train_size=train_to_test_ratio, shuffle=True, random_state=random_state)
+    train_dataset = Dataset(train_samples)
+    test_dataset = Dataset(test_samples)
+    return train_dataset, test_dataset