class RandomNodeSampler(torch.utils.data.DataLoader):
r"""A data loader that randomly samples nodes within a graph and returns
their induced subgraph.
.. note::
For an example of using :obj:`RandomNodeSampler`, see
`examples/ogbn_proteins_deepgcn.py
<https://github.com/rusty1s/pytorch_geometric/blob/master/examples/
ogbn_proteins_deepgcn.py>`_.
Args:
data (torch_geometric.data.Data): The graph data object.
num_parts (int): The number of partitions.
shuffle (bool, optional): If set to :obj:`True`, the data is reshuffled
at every epoch (default: :obj:`False`).
**kwargs (optional): Additional arguments of
:class:`torch.utils.data.DataLoader`, such as :obj:`num_workers`.
"""
def __init__(self, data, num_parts: int, shuffle: bool = False, **kwargs):
assert data.edge_index is not None
self.N = N = data.num_nodes
self.E = data.num_edges
self.adj = SparseTensor(row=data.edge_index[0],
col=data.edge_index[1],
value=torch.arange(
self.E, device=data.edge_index.device),
sparse_sizes=(N, N))
self.data = copy.copy(data)
self.data.edge_index = None
super(RandomNodeSampler, self).__init__(self,
batch_size=1,
sampler=RandomIndexSampler(
self.N, num_parts,
shuffle),
collate_fn=self.__collate__,
**kwargs)
def __getitem__(self, idx):
return idx
def __collate__(self, node_idx):
node_idx = node_idx[0]
data = self.data.__class__()
data.num_nodes = node_idx.size(0)
adj, _ = self.adj.saint_subgraph(node_idx)
row, col, edge_idx = adj.coo()
data.edge_index = torch.stack([row, col], dim=0)
for key, item in self.data:
if isinstance(item, Tensor) and item.size(0) == self.N:
data[key] = item[node_idx]
elif isinstance(item, Tensor) and item.size(0) == self.E:
data[key] = item[edge_idx]
else:
data[key] = item
return data
def _filter(data, node_idx):
"""
presumably data_n_id and new_n_id are sorted
"""
new_data = Data()
N = data.num_nodes
E = data.edge_index.size(1)
adj = SparseTensor(row=data.edge_index[0],
col=data.edge_index[1],
value=data.edge_attr,
sparse_sizes=(N, N))
new_adj, edge_idx = adj.saint_subgraph(node_idx)
row, col, value = new_adj.coo()
for key, item in data:
if item.size(0) == N:
new_data[key] = item[node_idx]
elif item.size(0) == E:
new_data[key] = item[edge_idx]
else:
new_data[key] = item
new_data.edge_index = torch.stack([row, col], dim=0)
new_data.num_nodes = len(node_idx)
new_data.edge_attr = value
return new_data
class RandomNodeSampler(torch.utils.data.DataLoader):
def __init__(self, data, num_parts: int, shuffle: bool = False, **kwargs):
"""
Randomly sample nodes from a graph
:param data: adjacency matrix
:param num_parts: batch number
:param shuffle: shuffle the index
"""
assert data.edge_index is not None
self.N = N = data.num_nodes
self.E = data.num_edges
self.adj = SparseTensor(row=data.edge_index[0],
col=data.edge_index[1],
value=torch.arange(
self.E, device=data.edge_index.device),
sparse_sizes=(N, N))
self.data = copy.copy(data)
self.data.edge_index = None
super(RandomNodeSampler, self).__init__(self,
batch_size=1,
sampler=RandomIndexSampler(
self.N, num_parts,
shuffle),
collate_fn=self.__collate__,
**kwargs)
def __getitem__(self, idx):
return idx
def __collate__(self, node_idx):
node_idx = node_idx[0]
data = self.data.__class__()
data.num_nodes = node_idx.size(0)
adj, _ = self.adj.saint_subgraph(node_idx)
row, col, edge_idx = adj.coo()
data.edge_index = torch.stack([row, col], dim=0)
for key, item in self.data:
if item.size(0) == self.N:
data[key] = item[node_idx]
elif item.size(0) == self.E:
data[key] = item[edge_idx]
else:
data[key] = item
return data
class GraphSAINTSampler(object):
r"""The GraphSAINT sampler base class from the `"GraphSAINT: Graph
Sampling Based Inductive Learning Method"
<https://arxiv.org/abs/1907.04931>`_ paper.
Given a graph in a :obj:`data` object, this class samples nodes and
constructs subgraphs that can be processed in a mini-batch fashion.
Normalization coefficients for each mini-batch are given via
:obj:`node_norm` and :obj:`edge_norm` data attributes.
.. note::
See :class:`torch_geometric.data.GraphSAINTNodeSampler`,
:class:`torch_geometric.data.GraphSAINTEdgeSampler` and
:class:`torch_geometric.data.GraphSAINTRandomWalkSampler` for
currently supported samplers.
For an example of using GraphSAINT sampling, see
`examples/graph_saint.py <https://github.com/rusty1s/pytorch_geometric/
blob/master/examples/graph_saint.py>`_.
Args:
data (torch_geometric.data.Data): The graph data object.
batch_size (int): The approximate number of samples per batch to load.
num_steps (int, optional): The number of iterations.
(default: :obj:`1`)
sample_coverage (int): How many samples per node should be used to
compute normalization statistics. (default: :obj:`50`)
save_dir (string, optional): If set, will save normalization
statistics to the :obj:`save_dir` directory for faster re-use.
(default: :obj:`None`)
num_workers (int, optional): How many subprocesses to use for data
sampling.
:obj:`0` means that the data will be sampled in the main process.
(default: :obj:`0`)
"""
def __init__(self, data, batch_size, num_steps=1, sample_coverage=50,
save_dir=None, num_workers=0):
assert data.edge_index is not None
assert 'node_norm' not in data
assert 'edge_norm' not in data
self.N = N = data.num_nodes
self.E = data.num_edges
self.adj = SparseTensor(row=data.edge_index[0], col=data.edge_index[1],
value=data.edge_attr, sparse_sizes=(N, N))
self.data = copy.copy(data)
self.data.edge_index = None
self.data.edge_attr = None
self.batch_size = batch_size
self.num_steps = num_steps
self.sample_coverage = sample_coverage
self.num_workers = num_workers
self.__count__ = 0
if self.num_workers > 0:
self.__sample_queue__ = Queue()
self.__sample_workers__ = []
for _ in range(self.num_workers):
worker = Process(target=self.__put_sample__,
args=(self.__sample_queue__, ))
worker.daemon = True
worker.start()
self.__sample_workers__.append(worker)
path = osp.join(save_dir or '', self.__filename__)
if save_dir is not None and osp.exists(path):
self.node_norm, self.edge_norm = torch.load(path)
else:
self.node_norm, self.edge_norm = self.__compute_norm__()
if save_dir is not None:
torch.save((self.node_norm, self.edge_norm), path)
if self.num_workers > 0:
self.__data_queue__ = Queue()
self.__data_workers__ = []
for _ in range(self.num_workers):
worker = Process(target=self.__put_data__,
args=(self.__data_queue__, ))
worker.daemon = True
worker.start()
self.__data_workers__.append(worker)
@property
def __filename__(self):
return f'{self.__class__.__name__.lower()}_{self.sample_coverage}.pt'
def __sample_nodes__(self, num_examples):
raise NotImplementedError
def __sample__(self, num_examples):
node_samples = self.__sample_nodes__(num_examples)
samples = []
for node_idx in node_samples:
node_idx = node_idx.unique()
adj, edge_idx = self.adj.saint_subgraph(node_idx)
samples.append((node_idx, edge_idx, adj))
return samples
def __compute_norm__(self):
node_count = torch.zeros(self.N, dtype=torch.float)
edge_count = torch.zeros(self.E, dtype=torch.float)
num_samples = total_sampled_nodes = 0
pbar = tqdm(total=self.N * self.sample_coverage)
pbar.set_description('Compute GraphSAINT normalization')
while total_sampled_nodes < self.N * self.sample_coverage:
num_sampled_nodes = 0
if self.num_workers > 0:
for _ in range(200):
node_idx, edge_idx, _ = self.__sample_queue__.get()
node_count[node_idx] += 1
edge_count[edge_idx] += 1
num_sampled_nodes += node_idx.size(0)
else:
samples = self.__sample__(200)
for node_idx, edge_idx, _ in samples:
node_count[node_idx] += 1
edge_count[edge_idx] += 1
num_sampled_nodes += node_idx.size(0)
pbar.update(num_sampled_nodes)
total_sampled_nodes += num_sampled_nodes
num_samples += 200
pbar.close()
row, col, _ = self.adj.coo()
edge_norm = (node_count[col] / edge_count).clamp_(0, 1e4)
edge_norm[torch.isnan(edge_norm)] = 0.1
node_count[node_count == 0] = 0.1
node_norm = num_samples / node_count / self.N
return node_norm, edge_norm
def __get_data_from_sample__(self, sample):
node_idx, edge_idx, adj = sample
data = self.data.__class__()
data.num_nodes = node_idx.size(0)
row, col, value = adj.coo()
data.edge_index = torch.stack([row, col], dim=0)
data.edge_attr = value
for key, item in self.data:
if item.size(0) == self.N:
data[key] = item[node_idx]
elif item.size(0) == self.E:
data[key] = item[edge_idx]
else:
data[key] = item
data.node_norm = self.node_norm[node_idx]
data.edge_norm = self.edge_norm[edge_idx]
return data
def __put_sample__(self, queue):
while True:
sample = self.__sample__(1)[0]
queue.put(sample)
def __put_data__(self, queue):
while True:
sample = self.__sample_queue__.get()
data = self.__get_data_from_sample__(sample)
queue.put(data)
def __next__(self):
if self.__count__ < len(self):
self.__count__ += 1
if self.num_workers > 0:
data = self.__data_queue__.get()
else:
sample = self.__sample__(1)[0]
data = self.__get_data_from_sample__(sample)
return data
else:
raise StopIteration
def __len__(self):
return self.num_steps
def __iter__(self):
self.__count__ = 0
return self
class GraphSAINTSampler(torch.utils.data.DataLoader):
r"""The GraphSAINT sampler base class from the `"GraphSAINT: Graph
Sampling Based Inductive Learning Method"
<https://arxiv.org/abs/1907.04931>`_ paper.
Given a graph in a :obj:`data` object, this class samples nodes and
constructs subgraphs that can be processed in a mini-batch fashion.
Normalization coefficients for each mini-batch are given via
:obj:`node_norm` and :obj:`edge_norm` data attributes.
.. note::
See :class:`torch_geometric.data.GraphSAINTNodeSampler`,
:class:`torch_geometric.data.GraphSAINTEdgeSampler` and
:class:`torch_geometric.data.GraphSAINTRandomWalkSampler` for
currently supported samplers.
For an example of using GraphSAINT sampling, see
`examples/graph_saint.py <https://github.com/rusty1s/pytorch_geometric/
blob/master/examples/graph_saint.py>`_.
Args:
data (torch_geometric.data.Data): The graph data object.
batch_size (int): The approximate number of samples per batch.
num_steps (int, optional): The number of iterations per epoch.
(default: :obj:`1`)
sample_coverage (int): How many samples per node should be used to
compute normalization statistics. (default: :obj:`0`)
save_dir (string, optional): If set, will save normalization
statistics to the :obj:`save_dir` directory for faster re-use.
(default: :obj:`None`)
log (bool, optional): If set to :obj:`False`, will not log any
pre-processing progress. (default: :obj:`True`)
**kwargs (optional): Additional arguments of
:class:`torch.utils.data.DataLoader`, such as :obj:`batch_size` or
:obj:`num_workers`.
"""
def __init__(self,
data,
batch_size: int,
num_steps: int = 1,
sample_coverage: int = 0,
save_dir: Optional[str] = None,
log: bool = True,
**kwargs):
assert data.edge_index is not None
assert 'node_norm' not in data
assert 'edge_norm' not in data
self.num_steps = num_steps
self.__batch_size__ = batch_size
self.sample_coverage = sample_coverage
self.log = log
self.N = N = data.num_nodes
self.E = data.num_edges
self.adj = SparseTensor(row=data.edge_index[0],
col=data.edge_index[1],
value=torch.arange(
self.E, device=data.edge_index.device),
sparse_sizes=(N, N))
self.data = copy.copy(data)
self.data.edge_index = None
super(GraphSAINTSampler, self).__init__(self,
batch_size=1,
collate_fn=self.__collate__,
**kwargs)
if self.sample_coverage > 0:
path = osp.join(save_dir or '', self.__filename__)
if save_dir is not None and osp.exists(path): # pragma: no cover
self.node_norm, self.edge_norm = torch.load(path)
else:
self.node_norm, self.edge_norm = self.__compute_norm__()
if save_dir is not None: # pragma: no cover
torch.save((self.node_norm, self.edge_norm), path)
@property
def __filename__(self):
return f'{self.__class__.__name__.lower()}_{self.sample_coverage}.pt'
def __len__(self):
return self.num_steps
def __sample_nodes__(self, batch_size):
raise NotImplementedError
def __getitem__(self, idx):
node_idx = self.__sample_nodes__(self.__batch_size__).unique()
adj, _ = self.adj.saint_subgraph(node_idx)
return node_idx, adj
def __collate__(self, data_list):
assert len(data_list) == 1
node_idx, adj = data_list[0]
data = self.data.__class__()
data.num_nodes = node_idx.size(0)
row, col, edge_idx = adj.coo()
data.edge_index = torch.stack([row, col], dim=0)
for key, item in self.data:
if isinstance(item, torch.Tensor) and item.size(0) == self.N:
data[key] = item[node_idx]
elif isinstance(item, torch.Tensor) and item.size(0) == self.E:
data[key] = item[edge_idx]
else:
data[key] = item
if self.sample_coverage > 0:
data.node_norm = self.node_norm[node_idx]
data.edge_norm = self.edge_norm[edge_idx]
return data
def __compute_norm__(self):
node_count = torch.zeros(self.N, dtype=torch.float)
edge_count = torch.zeros(self.E, dtype=torch.float)
loader = torch.utils.data.DataLoader(self,
batch_size=200,
collate_fn=lambda x: x,
num_workers=self.num_workers)
if self.log: # pragma: no cover
pbar = tqdm(total=self.N * self.sample_coverage)
pbar.set_description('Compute GraphSAINT normalization')
num_samples = total_sampled_nodes = 0
while total_sampled_nodes < self.N * self.sample_coverage:
for data in loader:
for node_idx, adj in data:
edge_idx = adj.storage.value()
node_count[node_idx] += 1
edge_count[edge_idx] += 1
total_sampled_nodes += node_idx.size(0)
if self.log: # pragma: no cover
pbar.update(node_idx.size(0))
num_samples += self.num_steps
if self.log: # pragma: no cover
pbar.close()
row, _, edge_idx = self.adj.coo()
t = torch.empty_like(edge_count).scatter_(0, edge_idx, node_count[row])
edge_norm = (t / edge_count).clamp_(0, 1e4)
edge_norm[torch.isnan(edge_norm)] = 0.1
node_count[node_count == 0] = 0.1
node_norm = num_samples / node_count / self.N
return node_norm, edge_norm
class Pruner(object):
def __init__(self, edge_index, split_idx, prune_set='train', ratio=0.9):
self.N = N = int(edge_index.max() + 1)
self.E = edge_index.size(1)
self.edge_index = edge_index
self.adj = SparseTensor(row=edge_index[0],
col=edge_index[1],
value=torch.arange(edge_index.size(1)),
sparse_sizes=(N, N),
is_sorted=False)
if prune_set == 'train':
self.train_idx = split_idx['train']
else:
self.train_idx = torch.cat(
[split_idx['train'], split_idx['valid']])
subadj, _ = self.adj.saint_subgraph(self.train_idx)
# subadj = self.adj.to_dense()[self.train_idx][:,self.train_idx].view(-1)
_, _, e_idx = subadj.coo()
self.train_e_idx = e_idx.squeeze().long()
self.train_edge_index = self.edge_index[:, self.train_e_idx]
self.rest_e_idx = torch.LongTensor(
list(set(range(self.E)) - set(self.train_e_idx.tolist())))
self.ratio = ratio
self.loss = torch.zeros(N)
self.times = 0
def prune(self, naive=False):
i = self.times
diff_loss = torch.abs(self.loss[self.train_edge_index[0]] -
self.loss[self.train_edge_index[1]])
# print(diff_loss.nonzero().size())
# print(int(len(diff_loss)*ratio))
_, mask1 = torch.topk(diff_loss,
int(len(diff_loss) * self.ratio),
largest=False)
newE = self.train_edge_index.size(1)
mask2 = torch.randperm(newE)[:int(newE * self.ratio)]
torch.save(self.train_edge_index,
f'./savept/pre_prune_edges_{self.ratio ** i:.4f}.pt')
torch.save(
mask1, f'./savept/smart_mask_prune_edges_{self.ratio ** i:.4f}.pt')
torch.save(
mask2, f'./savept/naive_mask_prune_edges_{self.ratio ** i:.4f}.pt')
torch.save(self.loss, f'./savept/loss_{self.ratio ** i:.4f}.pt')
self.times += 1
if naive == False:
mask = mask1
else:
mask = mask2
self.train_e_idx = self.train_e_idx[mask]
self.train_edge_index = self.train_edge_index[:, mask]
self.edge_index = self.edge_index[:,
torch.cat([
self.train_e_idx, self.rest_e_idx
])]
self.train_e_idx = torch.arange(self.train_e_idx.size(0))
self.rest_e_idx = torch.arange(
self.train_e_idx.size(0),
self.train_e_idx.size(0) + self.rest_e_idx.size(0))
self.E = self.edge_index.size(1)
print(
f'****************trainE : {self.train_e_idx.size(0)} ,restE:{self.rest_e_idx.size(0)}, totalE:{self.E}'
)
def update_loss(self, loss):
self.loss = loss
class MySAINTSampler(object):
r"""A new random-walk sampler for GraphSAINT that samples initial nodes
by iterating over node permutations. The benefit is that we can leverage
this sampler for subgraph-based inference.
Args:
data (torch_geometric.data.Data): The graph data object.
batch_size (int): The number of walks to sample per batch.
walk_length (int): The length of each random walk.
sample_coverage (int): How many samples per node should be used to
compute normalization statistics. (default: :obj:`50`)
save_dir (string, optional): If set, will save normalization
statistics to the :obj:`save_dir` directory for faster re-use.
(default: :obj:`None`)
log (bool, optional): If set to :obj:`False`, will not log any
progress. (default: :obj:`True`)
"""
def __init__(self, data, batch_size, sample_type='random_walk', walk_length=2, sample_coverage=50,
save_dir=None, log=True):
assert data.edge_index is not None
assert 'node_norm' not in data
assert 'edge_norm' not in data
assert sample_type in ('node', 'random_walk')
self.N = N = data.num_nodes
self.E = data.num_edges
self.adj = SparseTensor(row=data.edge_index[0], col=data.edge_index[1],
value=data.edge_attr, sparse_sizes=(N, N))
self.data = copy.copy(data)
self.data.edge_index = None
self.data.edge_attr = None
self.sample_type = sample_type
self.batch_size = batch_size
# self.num_steps = num_steps
self.walk_length = walk_length
self.sample_coverage = sample_coverage
self.log = log
path = osp.join(save_dir or '', self.__filename__)
if save_dir is not None and osp.exists(path): # pragma: no cover
self.node_norm, self.edge_norm = torch.load(path)
else:
self.node_norm, self.edge_norm = self.__compute_norm__()
if save_dir is not None: # pragma: no cover
torch.save((self.node_norm, self.edge_norm), path)
@property
def __filename__(self):
return f'{self.__class__.__name__.lower()}_{self.sample_coverage}.pt'
def __sample_nodes__(self):
"""Sampling initial nodes by iterating over the random permutation of nodes"""
tmp_map = torch.arange(self.N, dtype=torch.long)
all_n_id = torch.randperm(self.N, dtype=torch.long)
node_samples = []
for s_id in range(0, self.N, self.batch_size):
init_n_id = all_n_id[s_id:s_id+self.batch_size] # [batch_size]
if self.sample_type == 'random_walk':
n_id = self.adj.random_walk(init_n_id, self.walk_length) # [batch_size, walk_length+1]
n_id = n_id.flatten().unique() # [num_nodes_in_subgraph]
tmp_map[n_id] = torch.arange(n_id.size(0), dtype=torch.long)
res_n_id = tmp_map[init_n_id]
elif self.sample_type == 'node':
n_id = init_n_id
res_n_id = torch.arange(n_id.size(0), dtype=torch.long)
else:
raise ValueError('Unsupported value type {}'.format(self.sample_type))
node_samples.append((n_id, res_n_id))
return node_samples
def __sample__(self, num_epoches):
samples = []
for _ in range(num_epoches):
node_samples = self.__sample_nodes__()
for n_id, res_n_id in node_samples:
adj, e_id = self.adj.saint_subgraph(n_id)
samples.append((n_id, e_id, adj, res_n_id))
return samples
def __compute_norm__(self):
node_count = torch.zeros(self.N, dtype=torch.float)
edge_count = torch.zeros(self.E, dtype=torch.float)
if self.log:
pbar = tqdm(total=self.sample_coverage)
pbar.set_description('GraphSAINT Normalization')
num_samples = len(self) * self.sample_coverage
for _ in range(self.sample_coverage):
samples = self.__sample__(1)
for n_id, e_id, _, _ in samples:
node_count[n_id] += 1
edge_count[e_id] += 1
if self.log:
pbar.update(1)
row, col, _ = self.adj.coo()
edge_norm = (node_count[col] / edge_count).clamp_(0, 1e4)
edge_norm[torch.isnan(edge_norm)] = 0.1
node_count[node_count == 0] = 0.1
node_norm = num_samples / (node_count * self.N)
return node_norm, edge_norm
def __get_data_from_sample__(self, sample):
n_id, e_id, adj, res_n_id = sample
data = self.data.__class__()
data.num_nodes = n_id.size(0)
row, col, value = adj.coo()
data.edge_index = torch.stack([row, col], dim=0)
data.edge_attr = value
for key, item in self.data:
if item.size(0) == self.N:
data[key] = item[n_id]
elif item.size(0) == self.E:
data[key] = item[e_id]
else:
data[key] = item
data.node_norm = self.node_norm[n_id]
data.edge_norm = self.edge_norm[e_id]
data.n_id = n_id
data.res_n_id = res_n_id
return data
def __len__(self):
return (self.N + self.batch_size-1) // self.batch_size
def __iter__(self):
for sample in self.__sample__(1):
data = self.__get_data_from_sample__(sample)
yield data
class GraphSAINTSampler(torch.utils.data.DataLoader):
def __init__(self, data, batch_size: int, num_steps: int = 1,
sample_coverage: int = 0, save_dir: Optional[str] = None,
log: bool = True, **kwargs):
assert data.edge_index is not None
assert 'node_norm' not in data
assert 'edge_norm' not in data
self.num_steps = num_steps
self.__batch_size__ = batch_size
self.sample_coverage = sample_coverage
self.log = log
self.N = N = data.num_nodes
self.E = data.num_edges
self.adj = SparseTensor(
row=data.edge_index[0], col=data.edge_index[1],
value=torch.arange(self.E, device=data.edge_index.device),
sparse_sizes=(N, N))
self.data = copy.copy(data)
self.data.edge_index = None
super(GraphSAINTSampler,
self).__init__(self, batch_size=1, collate_fn=self.__collate__,
**kwargs)
if self.sample_coverage > 0:
path = osp.join(save_dir or '', self.__filename__)
if save_dir is not None and osp.exists(path): # pragma: no cover
self.node_norm, self.edge_norm = torch.load(path)
else:
self.node_norm, self.edge_norm = self.__compute_norm__()
if save_dir is not None: # pragma: no cover
torch.save((self.node_norm, self.edge_norm), path)
@property
def __filename__(self):
return f'{self.__class__.__name__.lower()}_{self.sample_coverage}.pt'
def __len__(self):
return self.num_steps
def __sample_nodes__(self, batch_size):
raise NotImplementedError
def __getitem__(self, idx):
node_idx = self.__sample_nodes__(self.__batch_size__).unique()
adj, _ = self.adj.saint_subgraph(node_idx)
return node_idx, adj
def __collate__(self, data_list):
assert len(data_list) == 1
node_idx, adj = data_list[0]
data = self.data.__class__()
data.num_nodes = node_idx.size(0)
row, col, edge_idx = adj.coo()
data.edge_index = torch.stack([row, col], dim=0)
for key, item in self.data:
if isinstance(item, torch.Tensor) and item.size(0) == self.N:
data[key] = item[node_idx]
elif isinstance(item, torch.Tensor) and item.size(0) == self.E:
data[key] = item[edge_idx]
else:
data[key] = item
if self.sample_coverage > 0:
data.node_norm = self.node_norm[node_idx]
data.edge_norm = self.edge_norm[edge_idx]
return data
def __compute_norm__(self):
node_count = torch.zeros(self.N, dtype=torch.float)
edge_count = torch.zeros(self.E, dtype=torch.float)
loader = torch.utils.data.DataLoader(self, batch_size=200,
collate_fn=lambda x: x,
num_workers=self.num_workers)
if self.log:
pbar = tqdm(total=self.N * self.sample_coverage)
pbar.set_description('Compute GraphSAINT normalization')
num_samples = total_sampled_nodes = 0
while total_sampled_nodes < self.N * self.sample_coverage:
for data in loader:
for node_idx, adj in data:
edge_idx = adj.storage.value()
node_count[node_idx] += 1
edge_count[edge_idx] += 1
total_sampled_nodes += node_idx.size(0)
if self.log:
pbar.update(node_idx.size(0))
num_samples += 200
if self.log:
pbar.close()
row, _, edge_idx = self.adj.coo()
t = torch.empty_like(edge_count).scatter_(0, edge_idx, node_count[row])
edge_norm = (t / edge_count).clamp_(0, 1e4)
edge_norm[torch.isnan(edge_norm)] = 0.1
node_count[node_count == 0] = 0.1
node_norm = num_samples / node_count / self.N
return node_norm, edge_norm
class RandomNodeSampler(torch.utils.data.DataLoader):
r"""A data loader that randomly samples nodes within a graph and returns
their induced subgraph.
.. note::
For an example of using :obj:`RandomNodeSampler`, see
`examples/ogbn_proteins_deepgcn.py
<https://github.com/rusty1s/pytorch_geometric/blob/master/examples/
ogbn_proteins_deepgcn.py>`_.
Args:
data (torch_geometric.data.Data): The graph data object.
num_parts (int): The number of partitions.
shuffle (bool, optional): If set to :obj:`True`, the data is reshuffled
at every epoch (default: :obj:`False`).
**kwargs (optional): Additional arguments of
:class:`torch.utils.data.DataLoader`, such as :obj:`num_workers`.
"""
def __init__(self, data, num_parts: int, shuffle: bool = False, split_idx=None, num_edges=None, prune=False, prune_set='train', **kwargs):
assert data.edge_index is not None
self.N = N = data.num_nodes
if num_edges != None:
self.E = num_edges
else:
self.E = data.num_edges
self.split_idx = split_idx
self.adj = SparseTensor(
row=data.edge_index[0], col=data.edge_index[1],
value=torch.arange(self.E, device=data.edge_index.device),
sparse_sizes=(N, N))
self.data = copy.copy(data)
# self.data.edge_index = edge_index
super(RandomNodeSampler, self).__init__(
self, batch_size=1,
sampler=RandomIndexSampler(self.N, num_parts, shuffle),
collate_fn=self.__collate__, **kwargs)
if prune == True:
self.edge_index = data.edge_index
if prune_set == 'train':
self.train_idx = self.split_idx['train']
else:
self.train_idx = torch.cat([self.split_idx['train'], self.split_idx['valid']])
subadj, _ = self.adj.saint_subgraph(self.train_idx)
# subadj = self.adj.to_dense()[self.train_idx][:,self.train_idx].view(-1)
_,_,e_idx = subadj.coo()
self.train_e_idx = e_idx.squeeze().long()
self.train_edge_index = self.edge_index[:, self.train_e_idx]
self.rest_e_idx = torch.LongTensor(list(set(range(self.E)) - set(self.train_e_idx.tolist())))
self.times = 0
def __getitem__(self, idx):
return idx
def prune(self, loss, ratio=0, method='ada',globe=False, savept=False):
if globe == False:
if method=='ada':
diff_loss = torch.abs(loss[self.train_edge_index[0]] - loss[self.train_edge_index[1]])
print(diff_loss.size(0))
#print(diff_loss.nonzero().size())
# print(int(len(diff_loss)*ratio))
_, mask = torch.topk(diff_loss, int(len(diff_loss)*ratio), largest=False)
elif method=='random':
newE =self.train_edge_index.size(1)
mask = torch.randperm(newE)[:int(newE*ratio)]
elif method == 'naive':
degrees = scatter(torch.ones(self.train_edge_index.size(1)), self.train_edge_index[0])
thold = (degrees.max()*ratio).long()
prunemask = (degrees>thold).nonzero()
mymask = torch.ones(self.train_edge_index.size(1))
taway = []
for pru in prunemask:
p_eid = (self.train_edge_index[0]==pru.squeeze()).nonzero().squeeze()
p = p_eid[torch.randperm(p_eid.size(0))][thold:]
taway.append(p)
nonmask = torch.cat(taway)
mask = torch.ones(self.train_edge_index.size(1), dtype=torch.bool)
mask[nonmask] = False
self.train_e_idx = self.train_e_idx[mask]
self.train_edge_index = self.train_edge_index[:, mask]
# self.edge_attr = self.data.edge_attr[torch.cat([self.train_e_idx, self.rest_e_idx])]
self.edge_index = self.edge_index[:,torch.cat([self.train_e_idx, self.rest_e_idx])]
# print(self.data.edge_attr.size(), self.data.edge_index.size())
print('len',len(self.train_e_idx),len(self.rest_e_idx), self.train_edge_index.size(),self.edge_index.size())
self.data.edge_attr = self.data.edge_attr[torch.cat([self.train_e_idx, self.rest_e_idx])]
self.data.edge_index = self.data.edge_index[:,torch.cat([self.train_e_idx, self.rest_e_idx])]
self.train_e_idx = torch.arange(self.train_e_idx.size(0))
self.rest_e_idx = torch.arange(self.train_e_idx.size(0),self.train_e_idx.size(0) + self.rest_e_idx.size(0))
self.E = self.edge_index.size(1)
self.adj = SparseTensor(
row=self.edge_index[0], col=self.edge_index[1],
value=torch.arange(self.E, device=self.edge_index.device),
sparse_sizes=(self.N, self.N))
# if savept==True:
# torch.save(self.train_edge_index, f'./savept/edge_index_protein.pt')
# # torch.save(mask1, f'./savept/p_smart_mask_prune_edges_{ratio ** i:.4f}.pt')
# # torch.save(mask2, f'./savept/p_naive_mask_prune_edges_{ratio ** i:.4f}.pt')
# torch.save(loss, f'./savept/p_loss_protein.pt')
else:
if method == 'random':
mask = torch.randperm(self.E)[:int(self.E*ratio)]
elif method == 'naive':
degrees = scatter(torch.ones(self.data.edge_index.size(1)), self.data.edge_index[0])
thold = (degrees.max()*ratio).long()
prunemask = (degrees>thold).nonzero().squeeze()
mymask = torch.ones(self.data.edge_index.size(1))
taway = []
for pru in prunemask:
p_eid = (self.data.edge_index[0]==pru).nonzero().squeeze()
p = p_eid[torch.randperm(p_eid.size(0))][thold:]
taway.append(p)
nonmask = torch.cat(taway)
mask = torch.ones(self.data.edge_index.size(1), dtype=torch.bool)
mask[nonmask] = False
self.data.edge_index = self.data.edge_index[:,mask]
self.data.edge_attr = self.data.edge_attr[mask]
self.E = self.data.edge_index.size(1)
self.adj = SparseTensor(
row=self.data.edge_index[0], col=self.data.edge_index[1],
value=torch.arange(self.E, device=self.data.edge_index.device),
sparse_sizes=(self.N, self.N))
# def prune(self, loss, ratio, naive=False,cutoff=False, savept=False, random=False):
# #p_loss = loss[self.train_idx]
# i = self.times
# if naive== False:
# diff_loss = torch.abs(loss[self.train_edge_index[0]] - loss[self.train_edge_index[1]])
# # print(diff_loss.nonzero().size())
# # print(int(len(diff_loss)*ratio))
# _, mask = torch.topk(diff_loss, int(len(diff_loss) * ratio), largest=False)
# else:
# newE =self.train_edge_index.size(1)
# mask = torch.randperm(newE)[:int(newE * ratio)]
# if savept==True:
# torch.save(self.train_edge_index, f'./savept/edge_index_protein.pt')
# # torch.save(mask1, f'./savept/p_smart_mask_prune_edges_{ratio ** i:.4f}.pt')
# # torch.save(mask2, f'./savept/p_naive_mask_prune_edges_{ratio ** i:.4f}.pt')
# torch.save(loss, f'./savept/p_loss_protein.pt')
# # self.train_edge_index = self.train_edge_index[:,mask]
# # edge_index = torch.cat([self.train_edge_index,self.rest_edge_index], dim=1)
# # self.data.edge_index = edge_index
# self.train_e_idx = self.train_e_idx[mask]
# self.train_edge_index = self.train_edge_index[:, mask]
# self.data.edge_attr = self.data.edge_attr[torch.cat([self.train_e_idx, self.rest_e_idx])]
# self.data.edge_index = self.data.edge_index[:,torch.cat([self.train_e_idx, self.rest_e_idx])]
# # print(self.data.edge_attr.size(), self.data.edge_index.size())
# self.train_e_idx = torch.arange(self.train_e_idx.size(0))
# self.rest_e_idx = torch.arange(self.train_e_idx.size(0),self.train_e_idx.size(0) + self.rest_e_idx.size(0))
# # print(len(self.train_e_idx),len(self.rest_e_idx), self.train_edge_index.size(),self.data.edge_index.size())
# self.E = self.data.num_edges
# self.adj = SparseTensor(
# row=self.data.edge_index[0], col=self.data.edge_index[1],
# value=torch.arange(self.E, device=self.data.edge_index.device),
# sparse_sizes=(self.N, self.N))
def __collate__(self, node_idx):
node_idx = node_idx[0]
data = self.data.__class__()
data.num_nodes = node_idx.size(0)
data.n_id = node_idx
adj, _ = self.adj.saint_subgraph(node_idx)
row, col, edge_idx = adj.coo()
data.edge_index = torch.stack([row, col], dim=0)
for key, item in self.data:
if item.size(0) == self.N:
data[key] = item[node_idx]
elif item.size(0) == self.E and key != 'edge_index':
data[key] = item[edge_idx]
elif key!= 'edge_index':
data[key] = item
return data
class GraphSAINTSampler(torch.utils.data.DataLoader):
r"""The GraphSAINT sampler base class from the `"GraphSAINT: Graph
Sampling Based Inductive Learning Method"
<https://arxiv.org/abs/1907.04931>`_ paper.
Given a graph in a :obj:`data` object, this class samples nodes and
constructs subgraphs that can be processed in a mini-batch fashion.
Normalization coefficients for each mini-batch are given via
:obj:`node_norm` and :obj:`edge_norm` data attributes.
.. note::
See :class:`torch_geometric.data.GraphSAINTNodeSampler`,
:class:`torch_geometric.data.GraphSAINTEdgeSampler` and
:class:`torch_geometric.data.GraphSAINTRandomWalkSampler` for
currently supported samplers.
For an example of using GraphSAINT sampling, see
`examples/graph_saint.py <https://github.com/rusty1s/pytorch_geometric/
blob/master/examples/graph_saint.py>`_.
Args:
data (torch_geometric.data.Data): The graph data object.
batch_size (int): The approximate number of samples per batch.
num_steps (int, optional): The number of iterations per epoch.
(default: :obj:`1`)
sample_coverage (int): How many samples per node should be used to
compute normalization statistics. (default: :obj:`0`)
save_dir (string, optional): If set, will save normalization
statistics to the :obj:`save_dir` directory for faster re-use.
(default: :obj:`None`)
log (bool, optional): If set to :obj:`False`, will not log any
pre-processing progress. (default: :obj:`True`)
**kwargs (optional): Additional arguments of
:class:`torch.utils.data.DataLoader`, such as :obj:`batch_size` or
:obj:`num_workers`.
"""
def __init__(self, data, batch_size: int, num_steps: int = 1,
sample_coverage: int = 0, save_dir: Optional[str] = None,
log: bool = True, prune = False, prune_set='train', prune_type='adaptive',
**kwargs):
assert data.edge_index is not None
assert 'node_norm' not in data
assert 'edge_norm' not in data
self.num_steps = num_steps
self.__batch_size__ = batch_size
self.sample_coverage = sample_coverage
self.log = log
self.N = N = data.num_nodes
self.E = data.num_edges
self.adj = SparseTensor(
row=data.edge_index[0], col=data.edge_index[1],
value=torch.arange(self.E, device=data.edge_index.device),
sparse_sizes=(N, N))
self.data = copy.copy(data)
super(GraphSAINTSampler,
self).__init__(self, batch_size=1, collate_fn=self.__collate__,
**kwargs)
if prune == True:
if prune_set == 'train':
self.train_idx = self.data.train_mask.nonzero(as_tuple=False).squeeze()
else:
self.train_idx = (self.data.train_mask + self.data.valid_mask).nonzero(as_tuple=False).squeeze()
subadj, _ = self.adj.saint_subgraph(self.train_idx)
# subadj = self.adj.to_dense()[self.train_idx][:,self.train_idx].view(-1)
_,_,e_idx = subadj.coo()
self.train_e_idx = e_idx.squeeze().long()
self.train_edge_index = self.data.edge_index[:, self.train_e_idx]
self.rest_e_idx = torch.LongTensor(list(set(range(self.E)) - set(self.train_e_idx.tolist())))
# if self.sample_coverage > 0:
# path = osp.join(save_dir or '', self.__filename__)
# if save_dir is not None and osp.exists(path): # pragma: no cover
# self.node_norm, self.edge_norm = torch.load(path)
# else:
# self.node_norm, self.edge_norm = self.__compute_norm__()
# if save_dir is not None: # pragma: no cover
# torch.save((self.node_norm, self.edge_norm), path)
@property
def __filename__(self):
return f'{self.__class__.__name__.lower()}_{self.sample_coverage}.pt'
def __len__(self):
return self.num_steps
def __sample_nodes__(self, batch_size):
raise NotImplementedError
def __getitem__(self, idx):
node_idx = self.__sample_nodes__(self.__batch_size__).unique()
adj, _ = self.adj.saint_subgraph(node_idx)
return node_idx, adj
def prune(self, loss, ratio=0, method='ada',glob=False):
if glob == False:
if method=='ada':
diff_loss = torch.abs(loss[self.train_edge_index[0]] - loss[self.train_edge_index[1]])
#print(diff_loss.nonzero().size())
# print(int(len(diff_loss)*ratio))
_, mask = torch.topk(diff_loss, int(len(diff_loss)*ratio), largest=False)
elif method=='random':
newE =self.train_edge_index.size(1)
mask = torch.randperm(newE)[:int(newE*ratio)]
elif method == 'naive':
degrees = scatter(torch.ones(self.train_edge_index.size(1)), self.train_edge_index[0])
thold = (degrees.max()*ratio).long()
prunemask = (degrees>thold).nonzero()
# print(prunemask)
mymask = torch.ones(self.train_edge_index.size(1))
taway = []
for pru in prunemask:
p_eid = (self.train_edge_index[0]==pru).nonzero().squeeze()
p = p_eid[torch.randperm(p_eid.size(0))][thold:]
taway.append(p)
nonmask = torch.cat(taway)
mask = torch.ones(self.train_edge_index.size(1), dtype=torch.bool)
mask[nonmask] = False
# print(mask.size())
# mask = (diff_loss <= threshold)
# self.train_edge_index = self.train_edge_index[:,mask]
# edge_index = torch.cat([self.train_edge_index,self.rest_edge_index], dim=1)
# self.data.edge_index = edge_index
self.train_e_idx = self.train_e_idx[mask]
self.train_edge_index = self.train_edge_index[:, mask]
# print('train', self.train_edge_index.size())
self.data.edge_attr = self.data.edge_attr[torch.cat([self.train_e_idx, self.rest_e_idx])]
self.data.edge_index = self.data.edge_index[:,torch.cat([self.train_e_idx, self.rest_e_idx])]
# print(self.data.edge_attr.size(), self.data.edge_index.size())
self.train_e_idx = torch.arange(self.train_e_idx.size(0))
self.rest_e_idx = torch.arange(self.train_e_idx.size(0),self.train_e_idx.size(0) + self.rest_e_idx.size(0))
# print(len(self.train_e_idx),len(self.rest_e_idx), self.train_edge_index.size(),self.data.edge_index.size())
self.E = self.data.num_edges
self.adj = SparseTensor(
row=self.data.edge_index[0], col=self.data.edge_index[1],
value=torch.arange(self.E, device=self.data.edge_index.device),
sparse_sizes=(self.N, self.N))
# def prune(self, loss, ratio=0, naive=False):
# if naive == False:
# diff_loss = torch.abs(loss[self.train_edge_index[0]] - loss[self.train_edge_index[1]])
# print(diff_loss.nonzero().size())
# # print(int(len(diff_loss)*ratio))
# # print(diff_loss)
# _, mask = torch.topk(diff_loss, int(diff_loss.size(0)*ratio), largest=False)
# else:
# newE =self.train_edge_index.size(1)
# mask = torch.randperm(newE)[:int(newE*ratio)]
# # print(mask.size())
# # mask = (diff_loss <= threshold)
# # self.train_edge_index = self.train_edge_index[:,mask]
# # edge_index = torch.cat([self.train_edge_index,self.rest_edge_index], dim=1)
# # self.data.edge_index = edge_index
# self.train_e_idx = self.train_e_idx[mask]
# self.train_edge_index = self.train_edge_index[:, mask]
# # print('train', self.train_edge_index.size())
# self.data.edge_attr = self.data.edge_attr[torch.cat([self.train_e_idx, self.rest_e_idx])]
# self.data.edge_index = self.data.edge_index[:,torch.cat([self.train_e_idx, self.rest_e_idx])]
# # print(self.data.edge_attr.size(), self.data.edge_index.size())
# self.train_e_idx = torch.arange(self.train_e_idx.size(0))
# self.rest_e_idx = torch.arange(self.train_e_idx.size(0),self.train_e_idx.size(0) + self.rest_e_idx.size(0))
# # print(len(self.train_e_idx),len(self.rest_e_idx), self.train_edge_index.size(),self.data.edge_index.size())
# self.E = self.data.num_edges
# self.adj = SparseTensor(
# row=self.data.edge_index[0], col=self.data.edge_index[1],
# value=torch.arange(self.E, device=self.data.edge_index.device),
# sparse_sizes=(self.N, self.N))
def __collate__(self, data_list):
assert len(data_list) == 1
node_idx, adj = data_list[0]
data = self.data.__class__()
data.num_nodes = node_idx.size(0)
data.node_idx = node_idx
row, col, edge_idx = adj.coo()
data.edge_index = torch.stack([row, col], dim=0)
for key, item in self.data:
if item.size(0) == self.N:
data[key] = item[node_idx]
elif item.size(0) == self.E and key != 'edge_index':
data[key] = item[edge_idx]
elif key!= 'edge_index':
data[key] = item
# if self.sample_coverage > 0:
# data.node_norm = self.node_norm[node_idx]
# data.edge_norm = self.edge_norm[edge_idx]
return data
class MyNeighborSampler(NeighborSampler):
def __init__(self, data, size, num_hops,
batch_size=1, shuffle=False, drop_last=False, bipartite=True,
add_self_loops=False, flow='source_to_target',
use_negative_sampling=False, neg_sample_ratio=None):
self.N = N = data.num_nodes
self.E = data.num_edges
self.adj = SparseTensor(
row=data.edge_index[0], col=data.edge_index[1],
value=torch.arange(self.E, device=data.edge_index.device),
sparse_sizes=(N, N))
if use_negative_sampling:
assert neg_sample_ratio is not None
assert neg_sample_ratio > 0.0
self.use_negative_sampling = use_negative_sampling
self.num_proc = mp.cpu_count()
self.neg_sample_ratio = neg_sample_ratio
super().__init__(data, size, num_hops, batch_size, shuffle, drop_last, bipartite, add_self_loops, flow)
def __produce_subgraph__(self, b_id):
r"""Produces a :obj:`Data` object holding the subgraph data for a given
mini-batch :obj:`b_id`."""
n_ids = [b_id]
e_ids = []
edge_indices = []
for l in range(self.num_hops):
e_id = neighbor_sampler(n_ids[-1], self.cumdeg, self.size[l])
n_id = self.edge_index_j.index_select(0, e_id)
n_id = n_id.unique(sorted=False)
n_ids.append(n_id)
e_ids.append(self.e_assoc.index_select(0, e_id))
edge_index = self.data.edge_index.index_select(1, e_ids[-1])
edge_indices.append(edge_index)
n_id = torch.unique(torch.cat(n_ids, dim=0), sorted=False)
self.tmp[n_id] = torch.arange(n_id.size(0))
e_id = torch.cat(e_ids, dim=0)
edge_index = self.tmp[torch.cat(edge_indices, dim=1)]
num_nodes = n_id.size(0)
idx = edge_index[0] * num_nodes + edge_index[1]
idx, inv = idx.unique(sorted=False, return_inverse=True)
edge_index = torch.stack([idx / num_nodes, idx % num_nodes], dim=0)
e_id = e_id.new_zeros(edge_index.size(1)).scatter_(0, inv, e_id)
# n_id: original ID of nodes in the whole sub-graph.
# b_id: original ID of nodes in the training graph.
# sub_b_id: sampled ID of nodes in the training graph.
# Get full-subgraph for negative sampling.
# Will be deleted at __call__.
if self.use_negative_sampling:
adj, _ = self.adj.saint_subgraph(n_id)
row, col, edge_idx = adj.coo()
full_edge_index = torch.stack([row, col], dim=0)
else:
full_edge_index = None
return Data(edge_index=edge_index, e_id=e_id, n_id=n_id, b_id=b_id,
sub_b_id=self.tmp[b_id], full_edge_index=full_edge_index, num_nodes=num_nodes)
def __call__(self, subset=None):
r"""Returns a generator of :obj:`DataFlow` that iterates over the nodes
in :obj:`subset` in a mini-batch fashion.
Args:
subset (LongTensor or BoolTensor, optional): The initial nodes to
propagate messages to. If set to :obj:`None`, will iterate over
all nodes in the graph. (default: :obj:`None`)
"""
if self.bipartite:
produce = self.__produce_bipartite_data_flow__
else:
produce = self.__produce_subgraph__
if not self.use_negative_sampling:
for n_id in self.__get_batches__(subset):
yield produce(n_id)
else:
yield from self.__call_with_negatives__(subset, produce)
def __call_with_negatives__(self, subset, produce):
for n_id_group in grouper(self.__get_batches__(subset), self.num_proc):
# print("produce start ~ ", end=""); t0 = time.time()
produced_data_list = [produce(n_id) for n_id in n_id_group]
# print("end: {}".format(time.time() - t0))
ns_generator = fetch_and_generate(
iters=[(p_data.full_edge_index.numpy(),
p_data.n_id.size(0),
int(self.neg_sample_ratio * p_data.edge_index.size(1)))
for p_data in produced_data_list],
func=negative_sampling_numpy,
num_proc=self.num_proc,
)
# print("yield start ~ ", end=""); t0 = time.time()
for p_data, ns in zip(produced_data_list, ns_generator):
del p_data.full_edge_index
p_data.neg_edge_index = torch.as_tensor(ns).long()
yield p_data