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Add Megatron .bin file sharding and unsharding scripts #45

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merged 4 commits into from
Jan 4, 2023
Merged

Add Megatron .bin file sharding and unsharding scripts #45

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fc2fc6b
Add .bin file sharding and unsharding scripts
haileyschoelkopf Dec 27, 2022
f3eb842
recent fixes to sharding scripts
haileyschoelkopf Dec 27, 2022
47f5541
correct size of final shard
haileyschoelkopf Dec 28, 2022
011a473
cleanup unsharding script
haileyschoelkopf Jan 1, 2023
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recent fixes to sharding scripts
  • Loading branch information
@haileyschoelkopf
haileyschoelkopf committed Dec 27, 2022
commit f3eb842b143f78a2a22504a02994160ce87d24ba
6 changes: 3 additions & 3 deletions utils/shard_memmap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,8 @@ def shard(
input_file: str,
output_dir: str,
):
"""Shard a Megatron .bin file into ~ 9 GB chunks"""
SHARD_SIZE = 10_000_000_000 # bytes ~= 9 GB
"""Shard a Megatron .bin file into ~ 4.5 GB chunks"""
SHARD_SIZE = 5_000_000_000 # bytes ~= 4.5 GB

# load in memmapped .bin file
full_idx_map = np.memmap(input_file, mode="r", order="C")
Expand Down Expand Up @@ -58,4 +58,4 @@ def shard(

os.makedirs(args.output_dir, exist_ok=True)

shard(args.input_file, args.output_dir)
shard(args.input_file, args.output_dir)
24 changes: 16 additions & 8 deletions utils/unshard_memmap.py
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Expand Up @@ -11,11 +11,15 @@ def unshard(
output_dir: str,
):
"""Reconstruct a Megatron .bin file from shards"""

SHARD_SIZE = 5_000_000_000

input_dir = os.path.dirname(input_file)
base_filename = os.path.basename(input_file)[:-19] # remove 00000-of-xxxxx.bin suffix from shard 0's filename


full_idx_map = None
open(os.path.join(output_dir, base_filename) + ".bin", "w+").close()
full_idx_map = np.memmap(os.path.join(output_dir, base_filename) + ".bin", shape=(num_shards * SHARD_SIZE,), mode="w+", order="C")
print(full_idx_map.shape)

# chunk by iterating over file
print(f"Loading {num_shards} shards from {input_dir}")
Expand All @@ -25,11 +29,15 @@ def unshard(
print(shard_filename)
shard_memmap = np.memmap(shard_filename, mode="r", order="C")

if not full_idx_map:
full_idx_map = shard_memmap
else:
np.concatenate([full_idx_map, shard_memmap])
#if full_idx_map is None:
# full_idx_map = shard_memmap
#else:
# full_idx_map = np.concatenate([full_idx_map, shard_memmap])

full_idx_map[i * SHARD_SIZE: (i + 1) * SHARD_SIZE] = shard_memmap

del shard_memmap
print(full_idx_map.shape)

# write full file
with open(os.path.join(output_dir, base_filename) + ".bin", "wb+") as out_full_file:
Expand All @@ -51,7 +59,7 @@ def unshard(
parser.add_argument(
"--num_shards",
type=int,
help="Provide number of shards (The total seen in shard filenames)"
help="Provide number of shards (The total seen in shard filenames + 1)"
)
parser.add_argument(
"--output_dir",
Expand All @@ -62,4 +70,4 @@ def unshard(

os.makedirs(args.output_dir, exist_ok=True)

unshard(args.input_file, args.num_shards, args.output_dir)
unshard(args.input_file, args.num_shards, args.output_dir)