<｜begin▁of▁sentence｜>### Instruction:
As a mediator specializing in scientific research collaborations, I have been asked to facilitate the identification of collaborative communities within the field of condensed matter physics. A graph representing collaborations from the year 2005 has been provided in a GML file named 'cond-mat-2005.gml'. Using the 'overlapping_seed_set_expansion' function from the 'cdlib' library, I have been tasked with identifying overlapping communities starting from a predefined set of seed nodes in this graph. After performing community detection, I am also expected to generate a JSON representation of the detected communities.
### Response:
import networkx as nx
from cdlib import algorithms

# Load the graph
G = nx.read_gml('cond-mat-2005.gml')

# Define seed nodes. These should be a list of nodes that as seeds for the communities
seeds = [0, 1, 2]  # Example seed nodes

# Run the overlapping seed set expansion algorithm
communities = algorithms.overlapping_seed_set_expansion(
    G,
    seeds=seeds,
    ninf=True,
    expansion='ppr',
    stopping='cond',
    nworkers=1,
    nruns=13,
    alpha=0.99,
    maxexpand=float('inf'),
    delta=0.2
)

# Generate a JSON representation of the detected communities
communities_json = communities.to_json()

print(communities_json)
<|EOT|>
