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# ran into memory issues with safetensors. this code moves by them.
import contextlib, json, mmap, os
import torch
class WritingSafeTensors:
def __init__(self, name, file_size=16*1024*1024*1024, **metadata):
self.name = name.removesuffix('.safetensors')
self.metadata = metadata
self.file = self.File(self.name + '.safetensors')
self.files = {self.file.filename:self.file}
self.file_size = file_size
self.total_size = 0
self.weight_map = {}
def add(self, name, tensor):
print(name, '...')
self.weight_map[name] = self.file
self.file.add(name, tensor)
if self.file.size >= self.file_size:
import pdb; pdb.set_trace()
'''BUG WHERE ONE TENSOR IS DROPPED'''
self.file.undo(name, tensor)
ct = len(self.files)
if len(self.files) == 1:
self.file.rename(f'{self.name}-{ct:05}.safetensors')
self.file.set_metadata(index = str(ct))
self.files = {self.file.filename:self.file}
self.file.finalize()
self.total_size += self.file.size
ct += 1
self.file = self.File(f'{self.name}-{ct:05}.safetensors', index = ct)
self.files[self.file.filename] = self.file
self.file.add(name, tensor)
assert name in self.file.header
def finalize(self):
self.file.finalize()
if len(self.files) > 1:
self.total_size += self.file.size
index_name = self.name + '.safetensors.index.json'
print(index_name, '...')
tot = len(self.files)
for ct, file in enumerate(self.files.values()):
ct += 1
file.rename(f'{self.name}-{ct:05}-of-{tot:06}.safetensors')
with open(index_name, 'w') as fh:
json.dump({
'metadata': {
**self.metadata,
'total_size': self.total_size,
},
'weight_map': {
name: file.filename
for name, file in self.weight_map.items()
}
},
indent = '\t',
}, fh)
del self.file
del self.files
del self.metadata
def delete(self):
for file in self.files.values():
file.delete()
del self.file
del self.files
del self.metadata
def __enter__(self):
return self
def __exit__(self, Exc, exc, tb):
throw = None
if Exc is None:
try:
self.finalize()
except:
self.delete()
raise
else:
self.delete()
class File:
def __init__(self, filename, **metadata):
self.filename = filename
self.fd = os.open(self.filename, os.O_RDWR | os.O_CREAT)
self.size = 0
self.capacity = 0
self.mmapview = None
self.header = {'__metadata__': {k:str(v) for k,v in metadata.items()}}
self.finalized = False
def _reserve(self, length):
if self.size + length > self.capacity:
new_capacity = self.size * 2
if new_capacity < self.size + length:
new_capacity = (((self.size + length)*2 - 1) // mmap.PAGESIZE + 1) * mmap.PAGESIZE
os.truncate(self.filename, new_capacity)
self.mmapview = memoryview(mmap.mmap(self.fd, new_capacity))
self.capacity = new_capacity
def add(self, name, tensor):
length = tensor.numel() * tensor.dtype.itemsize
self._reserve(length)
end = self.size + length
torch.frombuffer(
self.mmapview[self.size:end],
dtype=tensor.dtype, count=tensor.numel(),
).view(tensor.shape)[:] = tensor
self.header[name] = {
'dtype':
str(tensor.dtype).rsplit('.',1)[-1]
.replace('float','F')
.replace('uint','U')
.replace('int','I')
.removesuffix('fn')
.upper(),
'shape':
list(tensor.shape),
'data_offsets':
[self.size, end],
}
self.size = end
def undo(self, name, tensor):
length = tensor.numel() * tensor.dtype.itemsize
del self.header[name]
self.size -= length
def set_metadata(self, **metadata):
m = self.header['__metadata__']
for k, v in metadata.items():
m[k] = str(v)
def rename(self, filename):
os.rename(self.filename, filename)
self.filename = filename
return filename
def finalize(self):
print(self.filename, '...')
header = json.dumps(self.header, separators=[',',':']).encode()
insert = len(header) + 8
self._reserve(insert)
self.mmapview[insert:insert+self.size] = self.mmapview[:self.size]
self.size += insert
self.mmapview[:8] = len(header).to_bytes(8, 'little')
self.mmapview[8:insert] = header
del self.header
del self.mmapview
os.close(self.fd)
os.truncate(self.filename, self.size)
self.finalized = True
def delete(self):
if not self.finalized:
print('deleting', self.filename, '...')
del self.header
del self.mmapview
os.close(self.fd)
self.finalized = True
os.unlink(self.filename)
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