Space2Vec-xyz (XYZSpatialRelationLocationEncoder)

Overview

The XYZSpatialRelationLocationEncoder is designed for encoding spatial relations between locations. This encoder integrates a position encoding strategy, leveraging an XYZSpatialRelationPositionEncoder, and further processes the encoded positions through a customizable multi-layer feed-forward neural network.

Features

• Position Encoding (self.position_encoder): Utilizes the XYZSpatialRelationPositionEncoder to encode spatial differences (deltaX, deltaY) based on sinusoidal functions.

• Feed-Forward Neural Network (self.ffn): Transforms the position-encoded data through a series of feed-forward layers to produce high-dimensional spatial embeddings.

Configuration Parameters

• spa_embed_dim: Dimensionality of the spatial embedding output.

• coord_dim: Dimensionality of the coordinate space (e.g., 2D, 3D).

• device: Computation device (e.g., ‘cuda’ for GPU).

• ffn_act: Activation function for the feed-forward layers.

• ffn_num_hidden_layers: Number of hidden layers in the feed-forward network.

• ffn_dropout_rate: Dropout rate used in the feed-forward network.

• ffn_hidden_dim: Dimension of each hidden layer in the feed-forward network.

• ffn_use_layernormalize: Flag to enable layer normalization in the feed-forward network.

• ffn_skip_connection: Flag to enable skip connections in the feed-forward network.

• ffn_context_str: Context string for debugging and detailed logging within the network.

Methods

forward(coords)

• Purpose: Processes input coordinates through the location encoder to produce final spatial embeddings.

• Parameters:

  • coords (List or np.ndarray): Coordinates to process, expected to be in the form (batch_size, num_context_pt, coord_dim).

• Returns:

  • sprenc (Tensor): Spatial relation embeddings with a shape of (batch_size, num_context_pt, spa_embed_dim).

XYZSpatialRelationPositionEncoder

Features

• Sinusoidal Encoding: Utilizes sinusoidal functions to encode spatial differences, allowing for the representation of these differences in a form that neural networks can more effectively learn from.

• Configurable Parameters: Allows customization of encoding parameters such as the dimensionality of space and computational device.

Configuration Parameters

• coord_dim: Dimensionality of the space being encoded (e.g., 2D, 3D).

• device: Specifies the computational device, e.g., ‘cuda’ for GPU acceleration.

Methods

make_output_embeds(coords)

Processes a batch of coordinates and converts them into spatial relation embeddings.

• Parameters:

  • coords: Batch of spatial differences.

• Formulas:

  • Convert latitude lat and longitude lon coordinates into radians.

  • Calculate x, y, z coordinates using the following equations:

    

  • Concatenate x, y, z coordinates to form the high-dimensional vector representation.

• Returns:

  • Batch of spatial relation embeddings in high-dimensional space.

forward(coords)

Feeds the processed coordinates through the encoder to produce final spatial embeddings.

• Parameters:

  • coords: Coordinates to process.

• Returns:

  • Tensor of spatial relation embeddings.

Usage Example

encoder = XYZSpatialRelationLocationEncoder(
    spa_embed_dim=64,
    coord_dim=2,
    device="cuda",
    ffn_act="relu",
    ffn_num_hidden_layers=1,
    ffn_dropout_rate=0.5,
    ffn_hidden_dim=256,
    ffn_use_layernormalize=True,
    ffn_skip_connection=True,
    ffn_context_str="XYZSpatialRelationEncoder"
)

coords = np.array([...])  # your coordinate data
embeddings = encoder.forward(coords)