dmlc--dgl
xiang song(charlie.song)
67 行
1.9 KiB
Python
67 行
1.9 KiB
Python
import os
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import random
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import dgl.function as fn
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import torch
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import time
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from partition_utils import *
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class ClusterIter(object):
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'''The partition sampler given a DGLGraph and partition number.
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The metis is used as the graph partition backend.
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'''
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def __init__(self, dn, g, psize, batch_size, seed_nid):
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"""Initialize the sampler.
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Paramters
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---------
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dn : str
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The dataset name.
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g : DGLGraph
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The full graph of dataset
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psize: int
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The partition number
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batch_size: int
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The number of partitions in one batch
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seed_nid: np.ndarray
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The training nodes ids, used to extract the training graph
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"""
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self.psize = psize
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self.batch_size = batch_size
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# cache the partitions of known datasets&partition number
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if dn:
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fn = os.path.join('./datasets/', dn + '_{}.npy'.format(psize))
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if os.path.exists(fn):
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self.par_li = np.load(fn, allow_pickle=True)
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else:
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os.makedirs('./datasets/', exist_ok=True)
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self.par_li = get_partition_list(g, psize)
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np.save(fn, self.par_li)
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else:
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self.par_li = get_partition_list(g, psize)
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par_list = []
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for p in self.par_li:
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par = torch.Tensor(p)
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par_list.append(par)
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self.par_list = par_list
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# use one side normalization
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def get_norm(self, g):
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norm = 1. / g.in_degrees().float().unsqueeze(1)
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norm[torch.isinf(norm)] = 0
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norm = norm.to(self.g.ndata['feat'].device)
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return norm
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def __len__(self):
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return self.psize
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def __getitem__(self, idx):
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return self.par_li[idx]
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def subgraph_collate_fn(g, batch):
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nids = np.concatenate(batch).reshape(-1).astype(np.int64)
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g1 = g.subgraph(nids)
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return g1
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