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Add soft prompt support to TPU backend

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Gnome Ann
2021-11-21 18:08:04 -05:00
parent a60e7d3310
commit e068aa9f26
2 changed files with 62 additions and 16 deletions
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46
tpu_mtj_backend.py
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@ -1,5 +1,5 @@
import multiprocessing
from typing import Any, Dict, List
from typing import Any, Dict, List, Optional
import progressbar
import time
import os
@ -155,14 +155,14 @@ class PenalizingCausalTransformer(CausalTransformer):
def __init__(self, config):
# Initialize
super().__init__(config)
def generate(state, key, ctx, ctx_length, aux, sampler_options):
def generate(state, key, ctx, ctx_length, aux, sampler_options, soft_embeddings=None):
gen_length = self.gen_length
# These are the tokens that we don't want the AI to ever write
self.badwords = jnp.array([6880, 50256, 42496, 4613, 17414, 22039, 16410, 27, 29, 38430, 37922, 15913, 24618, 28725, 58, 47175, 36937, 26700, 12878, 16471, 37981, 5218, 29795, 13412, 45160, 3693, 49778, 4211, 20598, 36475, 33409, 44167, 32406, 29847, 29342, 42669, 685, 25787, 7359, 3784, 5320, 33994, 33490, 34516, 43734, 17635, 24293, 9959, 23785, 21737, 28401, 18161, 26358, 32509, 1279, 38155, 18189, 26894, 6927, 14610, 23834, 11037, 14631, 26933, 46904, 22330, 25915, 47934, 38214, 1875, 14692, 41832, 13163, 25970, 29565, 44926, 19841, 37250, 49029, 9609, 44438, 16791, 17816, 30109, 41888, 47527, 42924, 23984, 49074, 33717, 31161, 49082, 30138, 31175, 12240, 14804, 7131, 26076, 33250, 3556, 38381, 36338, 32756, 46581, 17912, 49146])
def generate_sample(context, ctx_length, aux):
# Give the initial context to the transformer
transformer = CausalTransformerShard(config)
_, initial_state = transformer.generate_initial(context, ctx_length)
_, initial_state = transformer.generate_initial(context, ctx_length, soft_embeddings=soft_embeddings)
# The "generated" array will contain the tokens from the
# context as well as the tokens picked by the sampler at
# each stage, padded with a bunch of 50256s, so we know
@ -185,7 +185,7 @@ class PenalizingCausalTransformer(CausalTransformer):
# how strongly it thinks each of the 50257 tokens in its
# vocabulary should be appended to the context, followed
# by 143 apparently useless columns ???)
logits, new_state = transformer.generate_once(next_token, decode_state)
logits, new_state = transformer.generate_once(next_token, decode_state, soft_embeddings=soft_embeddings)
# Verify that logits does indeed have that many rows and
# columns (if you get an error here, pray for mercy)
assert logits.shape == (1, config["n_vocab"])
@ -243,8 +243,8 @@ class PenalizingCausalTransformer(CausalTransformer):
return final_state, outputs
generate_fn = hk.transform(generate_sample).apply
return generate_fn(state["params"], key, ctx, ctx_length, aux)
self.generate_xmap = jax.experimental.maps.xmap(fun=generate, in_axes=(["shard", ...], ["batch", ...], ["batch", ...], ["batch", ...], ["batch", ...], ["batch", ...]), out_axes=["batch", ...], axis_resources={'shard': 'mp', 'batch': 'dp'})
def generate(self, ctx, ctx_length, gen_length, sampler_options, return_logits=False):
self.generate_xmap = jax.experimental.maps.xmap(fun=generate, in_axes=(["shard", ...], ["batch", ...], ["batch", ...], ["batch", ...], ["batch", ...], ["batch", ...], ["shard", ...]), out_axes=["batch", ...], axis_resources={'shard': 'mp', 'batch': 'dp'})
def generate(self, ctx, ctx_length, gen_length, sampler_options, return_logits=False, soft_embeddings=None):
key = hk.PRNGSequence(random.randint(0, 2 ** 60))
batch_size = ctx.shape[0]
aux = jnp.zeros((batch_size, gen_length), dtype=jnp.uint32)
@ -257,19 +257,33 @@ class PenalizingCausalTransformer(CausalTransformer):
ctx,
np.array(ctx_length, dtype=np.uint32),
aux,
sampler_options
sampler_options,
soft_embeddings,
)
def infer(context, top_p=0.9, temp=0.5, top_k=0, tfs=1.0, repetition_penalty=1.0, numseqs=1, gen_len=80) -> List[str]:
def infer(
context: str,
top_p=0.9,
temp=0.5,
top_k=0,
tfs=1.0,
repetition_penalty=1.0,
numseqs=1,
gen_len=80,
soft_embeddings: Optional[np.array] = None,
soft_tokens: Optional[np.array] = None,
) -> List[str]:
maps.thread_resources.env = thread_resources_env
total_batch = numseqs
tokens = tokenizer.encode(context, max_length=params["seq"], truncation=True)
provided_ctx = len(tokens)
tokens = np.uint32(tokenizer.encode(context, max_length=params["seq"] - soft_tokens.shape[0] if soft_tokens is not None else 0, truncation=True))
if(soft_tokens is not None):
tokens = np.uint32(np.concatenate((soft_tokens, tokens)))
provided_ctx = tokens.shape[0]
pad_amount = seq - provided_ctx
padded_tokens = np.pad(np.asarray(tokens, dtype=np.uint32), ((pad_amount, 0),), constant_values=pad_token_id)
padded_tokens = np.pad(tokens, ((pad_amount, 0),), constant_values=pad_token_id)
batched_tokens = np.array([padded_tokens] * total_batch)
length = np.ones(total_batch, dtype=np.uint32) * len(tokens)
length = np.ones(total_batch, dtype=np.uint32) * provided_ctx
samples = []
batched_generator_params = {
"temp": temp * np.ones(total_batch),
@ -278,7 +292,13 @@ def infer(context, top_p=0.9, temp=0.5, top_k=0, tfs=1.0, repetition_penalty=1.0
"repetition_penalty": repetition_penalty * np.ones(total_batch),
"top_k": np.full(total_batch, top_k, dtype=np.uint32)
}
output = network.generate(batched_tokens, length, gen_len, batched_generator_params)
output = network.generate(
batched_tokens,
length,
gen_len,
batched_generator_params,
soft_embeddings=soft_embeddings,
)
decoded_tokens = output[1][0]
for o in decoded_tokens[:, :, 0]:
samples.append(tokenizer.decode(o))