+ jRt^RIt^RIHt^RIHtRR.t]!^4]P!RRR7R RR/R ll44t ]!^4]P!RRR7R RR/R ll44t R#) zFunctions for generating graphs based on the "duplication" method. These graph generators start with a small initial graph then duplicate nodes and (partially) duplicate their edges. These functions are generally inspired by biological networks. N)py_random_state)check_create_usingpartial_duplication_graphduplication_divergence_graphT)graphs returns_graph create_usingcR\VRRR7pV^8gV^8gV^8gV^8dRp\P!V4hW8d\P!R4h\P!W4p\ W4FpVP ^V^, 4p VP V4\\P!Wy44F+p VP4V8gKVPW4K- VP4V8gKVPW4K V#)a!Returns a random graph using the partial duplication model. Parameters ---------- N : int The total number of nodes in the final graph. n : int The number of nodes in the initial clique. p : float The probability of joining each neighbor of a node to the duplicate node. Must be a number in the between zero and one, inclusive. q : float The probability of joining the source node to the duplicate node. Must be a number in the between zero and one, inclusive. seed : integer, random_state, or None (default) Indicator of random number generation state. See :ref:`Randomness`. create_using : Graph constructor, optional (default=nx.Graph) Graph type to create. If graph instance, then cleared before populated. Multigraph and directed types are not supported and raise a ``NetworkXError``. Notes ----- A graph of nodes is grown by creating a fully connected graph of size `n`. The following procedure is then repeated until a total of `N` nodes have been reached. 1. A random node, *u*, is picked and a new node, *v*, is created. 2. For each neighbor of *u* an edge from the neighbor to *v* is created with probability `p`. 3. An edge from *u* to *v* is created with probability `q`. This algorithm appears in [1]. This implementation allows the possibility of generating disconnected graphs. References ---------- .. [1] Knudsen Michael, and Carsten Wiuf. "A Markov chain approach to randomly grown graphs." Journal of Applied Mathematics 2008. Fdirected multigraphz3partial duplication graph must have 0 <= p, q <= 1.z+partial duplication graph must have n <= N.) rnx NetworkXErrorcomplete_graphrangerandintadd_nodelist all_neighborsrandomadd_edge) NnpqseedrmsgGnew_nodesrc_nodenbr_nodes &&&&&$ `/home/luca/screen-checking/.venv/lib/python3.14/site-packages/networkx/generators/duplication.pyrrsj&lUuUL1uAQ!a%Cs##uLMM !*A!K<<8a<0 8R--a:;H{{}q  8.< ;;=1  JJx * Hc@V^8gV^8dRV R2p\P!V4hV^8dRp\P!V4h\VRRR7p\P!VR7pVP ^^4^pW`8dVP \ V44pVPV4RpVPV4F-p VP4V8gKVP Wi4RpK/ V'gVPV4KV^, pKV#)aReturns an undirected graph using the duplication-divergence model. A graph of `n` nodes is created by duplicating the initial nodes and retaining edges incident to the original nodes with a retention probability `p`. Parameters ---------- n : int The desired number of nodes in the graph. p : float The probability for retaining the edge of the replicated node. seed : integer, random_state, or None (default) Indicator of random number generation state. See :ref:`Randomness`. create_using : Graph constructor, optional (default=nx.Graph) Graph type to create. If graph instance, then cleared before populated. Multigraph and directed types are not supported and raise a ``NetworkXError``. Returns ------- G : Graph Raises ------ NetworkXError If `p` is not a valid probability. If `n` is less than 2. Notes ----- This algorithm appears in [1]. This implementation disallows the possibility of generating disconnected graphs. References ---------- .. [1] I. Ispolatov, P. L. Krapivsky, A. Yuryev, "Duplication-divergence model of protein interaction network", Phys. Rev. E, 71, 061911, 2005. zNetworkXError p=z is not in [0,1].z$n must be greater than or equal to 2Fr )rT) r rr empty_graphrchoicerr neighborsr remove_node) rrrrrri random_nodeflagnbrs &&&$ r!rr`s\ 1uA #45s##1u4s##%lUuUL L1AJJq! A %kk$q'*  1 ;;{+C{{}q  1" ,  MM!  FA Hr")N) __doc__networkxr networkx.utilsrnetworkx.utils.miscr__all__ _dispatchablerrr"r!r3s*2 &(F GT2K TK 3K \T2K $K 3K r"