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| import re | |
| from flax.core.frozen_dict import freeze | |
| from flax.traverse_util import flatten_dict, unflatten_dict | |
| from jax.experimental import PartitionSpec as P | |
| # utils adapted from https://gitihub.com/google-research/google-research/blob/master/flax_models/t5x/partitions.py | |
| # Sentinels | |
| _unmatched = object() | |
| # For specifying empty leaf dict `{}` | |
| empty_dict = object() | |
| def _match(qs, ks): | |
| """Return True if regexes in qs match any window of strings in tuple ks.""" | |
| # compile regexes and force complete match | |
| qts = tuple(map(lambda x: re.compile(x + "$"), qs)) | |
| for i in range(len(ks) - len(qs) + 1): | |
| matches = [x.match(y) for x, y in zip(qts, ks[i:])] | |
| if matches and all(matches): | |
| return True | |
| return False | |
| def _replacement_rules(rules): | |
| def replace(key, val): | |
| for rule, replacement in rules: | |
| if _match(rule, key): | |
| return replacement | |
| return val | |
| return replace | |
| def _get_partition_rules(): | |
| return [ | |
| # embeddings | |
| ((r"embed_positions", "embedding"), P("mp", None)), | |
| ((r"embed_tokens", "embedding"), P("mp", None)), | |
| # self-attention | |
| ((r"self_attn", "(q_proj|k_proj|v_proj)", "kernel"), P(None, "mp")), | |
| ((r"self_attn", "out_proj", "kernel"), P("mp", None)), | |
| # enc-dec attention | |
| ((r"encoder_attn", "(q_proj|k_proj|v_proj)", "kernel"), P(None, "mp")), | |
| ((r"encoder_attn", "out_proj", "kernel"), P("mp", None)), | |
| # FFN | |
| ((r"fc1", "kernel"), P(None, "mp")), | |
| ((r"fc2", "kernel"), P("mp", None)), | |
| # layer norms | |
| ((r"layernorm_embedding", "(bias|scale)"), None), | |
| ((r"self_attn_layer_norm", "(bias|scale)"), None), | |
| ((r"encoder_attn_layer_norm", "(bias|scale)"), None), | |
| ((r"final_layer_norm", "(bias|scale)"), None), | |
| ((r"lm_head", "kernel"), P(None, "mp")), | |
| ] | |
| def set_partitions(in_dict): | |
| rules = _get_partition_rules() | |
| replace = _replacement_rules(rules) | |
| initd = {k: _unmatched for k in flatten_dict(in_dict)} | |
| result = {k: replace(k, v) for k, v in initd.items()} | |
| for k, v in result.items(): | |
| if v == _unmatched: | |
| print(k) | |
| assert _unmatched not in result.values(), "Incomplete partition spec." | |
| return freeze(unflatten_dict(result)) | |