def matfiles_to_lmdb(paths_src, path_dst, fieldname,
lut=None):
'''
Generate LMDB file from set of mat files with integer data
Source: https://github.com/BVLC/caffe/issues/1698#issuecomment-70211045
credit: Evan Shelhamer
'''
db = lmdb.open(path_dst, map_size=MAP_SZ)
with db.begin(write=True) as in_txn:
for idx, path_ in enumerate(paths_src):
content_field = io.loadmat(path_)[fieldname]
# get shape (1,H,W)
content_field = expand_dims(content_field, 3)
content_field = content_field.astype(int)
if lut is not None:
content_field = lut(content_field)
img_dat = caffe.io.array_to_datum(content_field)
in_txn.put(IDX_FMT.format(idx), img_dat.SerializeToString())
db.close()
return 0
def arrays_to_h5_fixed(arrs, key, path_dst):
'''
save list of arrays (all same size) to hdf5 under a single key
'''
with h5py.File(path_dst, "w") as f:
f[key] = [expand_dims(x, 3) for x in arrs]
def arrays_to_lmdb(arrs, path_dst):
'''
Generate LMDB file from list of ndarrays
'''
db = lmdb.open(path_dst, map_size=MAP_SZ)
with db.begin(write=True) as in_txn:
for idx, x in enumerate(arrs):
content_field = expand_dims(x, 3)
dat = caffe.io.array_to_datum(content_field)
in_txn.put(IDX_FMT.format(idx), dat.SerializeToString())
db.close()
return 0
def _infer_to_lmdb_cur_single_key(net, key_, n, db):
'''
Run network inference for n batches and save results to an lmdb for each key.
Higher time complexity but lower space complexity.
Takes advantage if there is only a single key
'''
idx = 0
with db.begin(write=True) as txn:
for _ in range(n):
d = forward(net, [key_])
l = []
l.extend(d[key_].astype(float))
for x in l:
x = expand_dims(x, 3)
txn.put(IDX_FMT.format(idx), caffe.io.array_to_datum(x).SerializeToString())
idx += 1
return [idx]
def scalars_to_lmdb(scalars, path_dst,
lut=None):
'''
Generate LMDB file from list of scalars
'''
db = lmdb.open(path_dst, map_size=MAP_SZ)
with db.begin(write=True) as in_txn:
if not hasattr(scalars, '__iter__'):
scalars = np.array([scalars])
for idx, x in enumerate(scalars):
if not hasattr(x, '__iter__'):
content_field = np.array([x])
else:
content_field = np.array(x)
# validate these are scalars
if content_field.size != 1:
raise AttributeError("Unexpected shape for scalar at i=%d (%s)"
% (idx, str(content_field.shape)))
# guarantee shape (1,1,1)
content_field = expand_dims(content_field, 3)
content_field = content_field.astype(int)
if lut is not None:
content_field = lut(content_field)
dat = caffe.io.array_to_datum(content_field)
in_txn.put(IDX_FMT.format(idx), dat.SerializeToString())
db.close()
return 0
def _infer_to_lmdb_cur_multi_key(net, keys, n, dbs):
'''
Run network inference for n batches and save results to an lmdb for each key.
Higher time complexity but lower space complexity.
See _infer_to_lmdb_cur_single_key() if there is only a single key
'''
idxs = [0] * len(keys)
for _ in range(n):
d = forward(net, keys)
for ik, k in enumerate(keys):
with dbs[k].begin(write=True) as txn:
l = []
l.extend(d[k].astype(float))
for x in l:
x = expand_dims(x, 3)
txn.put(IDX_FMT.format(idxs[ik]), caffe.io.array_to_datum(x).SerializeToString())
idxs[ik] += 1
return idxs
