Waseem AlShikh

AMAZING WORK - Based the updated model snippet and results, I’ll provide new and additional suggestions to further refine AdaptiveGESAL, targeting an RMSE of 10–16 cycles while maintaining efficiency and scalability.
The Accuracy (±50 cycles) => 100.0% is excellent, indicating robust generalization within the ±50 cycle tolerance, but RMSE/MAE show room for precision improvement.

The temporal layers (Conv1d, LSTM) are working well, but i belive having deeper or more specialized layers could capture finer degradation patterns.

Include parallel Conv1d layers with different kernel sizes (e.g., 3, 5, 7) to capture short- and long-term trends, then concatenate outputs before the LSTM:

self.conv1d_short = nn.Conv1d(input_dim, hidden_dim // 3, kernel_size=3, padding=1)
self.conv1d_med = nn.Conv1d(input_dim, hidden_dim // 3, kernel_size=5, padding=2)
self.conv1d_long = nn.Conv1d(input_dim, hidden_dim // 3, kernel_size=7, padding=3)
def forward(self, x):
    x = x.unsqueeze(1)  # (batch, 1, features)
    short = self.activation(self.conv1d_short(x))
    med = self.activation(self.conv1d_med(x))
    long = self.activation(self.conv1d_long(x))
    x = torch.cat([short, med, long], dim=2).squeeze(1)
    x, _ = self.lstm(x)
    # Continue with SVF and output layers

ANd improves temporal context, reducing MAE.

self.lstm = nn.LSTM(hidden_dim, hidden_dim // 2, batch_first=True, bidirectional=True, num_layers=1)
x, _ = self.lstm(x)  # Output shape: (batch, seq_len, hidden_dim)
x = x.squeeze(1) * 2  # Scale to match original hidden_dim

Then increases model capacity for complex patterns while maintaining efficiency via SVF like the below

original_fc1 = nn.Linear(256, 128)
original_fc2 = nn.Linear(128, 64)
original_fc3 = nn.Linear(64, 32)
self.svf1 = SVFLinear(original_fc1, dropout_rate=0.2, l2_lambda=0.01)
self.svf2 = SVFLinear(original_fc2, dropout_rate=0.2, l2_lambda=0.01)
self.svf3 = SVFLinear(original_fc3, dropout_rate=0.2, l2_lambda=0.01)
self.output_layer = nn.Linear(32, 1)

https://github.com/writer/AI-Adaptive-Learning-GESAL/blob/main/Adaptive_GESAL_NASA_dataset_2.ipynb

One more idea add temporal layers
Integrate 1D convolutional layers or LSTM layers before the SVFLinear layers to capture temporal dependencies in the sensor data over cycles. something like;

class AdaptiveGESAL(nn.Module):
    def __init__(self, input_dim=21, hidden_dim=128, num_nodes=50):
        super().__init__()
        self.conv1d = nn.Conv1d(input_dim, hidden_dim, kernel_size=3, padding=1)
        self.lstm = nn.LSTM(hidden_dim, hidden_dim, batch_first=True)
        self.svf_layers = [SVFLinear(nn.Linear(hidden_dim, hidden_dim)) for _ in range(2)]
        self.output_layer = nn.Linear(hidden_dim, 1)  # RUL prediction
        # Graph and SVF initialization as before

With replace MSE (implicit in RMSE) with a hybrid loss combining MSE and a quantile loss (e.g., 0.9 quantile for conservative RUL estimates) this penalizes underestimation, aligning with conservative RUL needs.

Few more suggestions:

• Use correlation analysis or techniques like Principal Component Analysis (PCA) to identify the most predictive features (e.g., vibration, temperature, pressure) and reduce noise from less relevant sensors.

• Transform features into time-series statistics (e.g., rolling averages, standard deviations, or slopes over cycles) to capture degradation trends. For example, compute a 10-cycle rolling mean for T30 (total temperature at LPC outlet) and Nf (physical fan speed).

• Normalize or standardize features (e.g., z-scores or min-max scaling) per engine to account for individual variability, ensuring AdaptiveGESAL’s embeddings better distinguish degradation states.

https://github.com/writer/AI-Adaptive-Learning-GESAL/blob/main/GESAL_synthetic_engine_maintenance_dataset.ipynb

The accuracy drop likely ties to prompt inconsistency—standardization is key. and if your setup can handle more nodes and data; focus on tuning distance_threshold.

Try these tweaks:

• Prompt: "Given Engine X with [params], predict ‘replace’, ‘maintenance’, or ‘check’ based on wear."

• Hyperparameters: temperature=0.4, top_k=20, distance_threshold=0.25, lr=0.005, buffer_size=10.

• Scale: Batch 500 engines, aiming for 10–15 nodes.

@oieieio This is awesome! What is your primary feedback on how I can improve it? I haven't had a chance to run it on a larger evaluation yet.