<｜begin▁of▁sentence｜>### Instruction:
Can you generate an undirected igraph instance from a given weighted adjacency matrix representing the structure and weights of a network, without considering loop edges?
### Response:
import igraph as ig

# Assuming 'weighted_adj_matrix' contains the adjacency matrix of the weighted graph
# This could be a list-of-lists, numpy 2D array, or a scipy.sparse matrix
weighted_adj_matrix = [
    [0, 2, 0],
    [2, 0, 1],
    [0, 1, 0]
]

# Create a graph from the weighted adjacency matrix
# Set mode to 'undirected' if you want an undirected graph
mode = "undirected"

# Create the graph
g = ig.Graph.Weighted_Adjacency(weighted_adj_matrix, mode=mode, attr="weight", loops=False)

print(g)
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