add SlicedDataset class and utility scripts; refactor: remove _path_fix.py and update imports;

src/single-core-regen/testing/sliced_dataset_test.py

@@ -0,0 +1,51 @@
+# move into dir single-core-regen before running
+
+from util.dataset import SlicedDataset
+from torch.utils.data import DataLoader
+from matplotlib import pyplot as plt
+import numpy as np
+
+def eye_dataset(dataset, no_symbols=None, offset=False, show=True):
+    if no_symbols is None:
+        no_symbols = len(dataset)
+    _, axs = plt.subplots(2,2, sharex=True, sharey=True)
+
+    xaxis = np.linspace(0,dataset.symbols_per_slice,dataset.samples_per_slice)
+    roll = dataset.samples_per_symbol//2 if offset else 0
+    for E_out, E_in in dataset[roll:dataset.samples_per_symbol*no_symbols+roll:dataset.samples_per_symbol]:
+        E_in_x, E_in_y, E_out_x, E_out_y = E_in[0], E_in[1], E_out[0], E_out[1]
+        axs[0,0].plot(xaxis, np.abs( E_in_x.numpy())**2, alpha=0.05, color='C0')
+        axs[1,0].plot(xaxis, np.abs( E_in_y.numpy())**2, alpha=0.05, color='C0')
+        axs[0,1].plot(xaxis, np.abs(E_out_x.numpy())**2, alpha=0.05, color='C0')
+        axs[1,1].plot(xaxis, np.abs(E_out_y.numpy())**2, alpha=0.05, color='C0')
+
+    if show:
+        plt.show()
+
+# def plt_dataloader(dataloader, show=True):
+#     _, axs = plt.subplots(2,2, sharex=True, sharey=True)
+
+#     E_outs, E_ins = next(iter(dataloader))
+#     for i, (E_out, E_in) in enumerate(zip(E_outs, E_ins)):
+#         xaxis = np.linspace(dataset.symbols_per_slice*i,dataset.symbols_per_slice+dataset.symbols_per_slice*i,dataset.samples_per_slice)
+#         E_in_x, E_in_y, E_out_x, E_out_y = E_in[0], E_in[1], E_out[0], E_out[1]
+#         axs[0,0].plot(xaxis, np.abs(E_in_x.numpy())**2)
+#         axs[1,0].plot(xaxis, np.abs(E_in_y.numpy())**2)
+#         axs[0,1].plot(xaxis, np.abs(E_out_x.numpy())**2)
+#         axs[1,1].plot(xaxis, np.abs(E_out_y.numpy())**2)
+
+#     if show:
+#         plt.show()
+
+if __name__ == "__main__":
+
+    dataset = SlicedDataset("data/20241115-175517-128-16384-10000-0-0-17-0-PAM4-0.ini", symbols=1, drop_first=100)
+    print(dataset[0][0].shape)
+
+    eye_dataset(dataset, 1000, offset=True, show=False)
+
+    train_loader = DataLoader(dataset, batch_size=10, shuffle=False)
+
+    # plt_dataloader(train_loader, show=False)
+
+    plt.show()