How to give Prompt to trained RETRO Model?

[shahmeer99]

I am following the instructions on the RETRO-pytorch GItHub repo. After training my model, how do I go about using it to generate responses?

retro = RETRO(
    chunk_size = 64,                         # the chunk size that is indexed and retrieved (needed for proper relative positions as well as causal chunked cross attention)
    max_seq_len = 2048,                      # max sequence length
    enc_dim = 896,                           # encoder model dim
    enc_depth = 2,                           # encoder depth
    dec_dim = 796,                           # decoder model dim
    dec_depth = 12,                          # decoder depth
    dec_cross_attn_layers = (3, 6, 9, 12),   # decoder cross attention layers (with causal chunk cross attention)
    heads = 8,                               # attention heads
    dim_head = 64,                           # dimension per head
    dec_attn_dropout = 0.25,                 # decoder attention dropout
    dec_ff_dropout = 0.25,                   # decoder feedforward dropout
    use_deepnet = True                       # turn on post-normalization with DeepNet residual scaling and initialization, for scaling to 1000 layers
)

seq = torch.randint(0, 20000, (2, 2048 + 1))      # plus one since it is split into input and labels for training
retrieved = torch.randint(0, 20000, (2, 32, 2, 128)) # retrieved tokens - (batch, num chunks, num retrieved neighbors, retrieved chunk with continuation)

loss = retro(seq, retrieved, return_loss = True)
loss.backward()

wrapper = TrainingWrapper(
    retro = retro,                                 # path to retro instance
    knn = 2,                                       # knn (2 in paper was sufficient)
    chunk_size = 64,                               # chunk size (64 in paper)
    documents_path = './retro_training_set/',              # path to folder of text
    glob = '**/*.txt',                             # text glob
    chunks_memmap_path = './train.chunks.dat',     # path to chunks
    seqs_memmap_path = './train.seq.dat',          # path to sequence data
    doc_ids_memmap_path = './train.doc_ids.dat',   # path to document ids per chunk (used for filtering neighbors belonging to same document)
    max_chunks = 1_000_000,                        # maximum cap to chunks
    max_seqs = 100_000,                            # maximum seqs
    knn_extra_neighbors = 100,                     # num extra neighbors to fetch
    max_index_memory_usage = '100m',
    current_memory_available = '1G'    
)

Now when I want to give this model a text input (any prompt), how would I go about doing that? Which method or function would I use? Which model/tokenizer should I use to encode the input prompt and then decode the model output tensor? Is there a method for that?

Example Prompt: "The movie Dune was released in"

[filipesilva]

https://github.com/lucidrains/RETRO-pytorch/issues/23 contains a notebook with a good example.

I think putting it together with the README instructions looks like this:

import torch
from retro_pytorch import RETRO, TrainingWrapper

# instantiate RETRO, fit it into the TrainingWrapper with correct settings

retro = RETRO(
    max_seq_len = 2048,                      # max sequence length
    enc_dim = 896,                           # encoder model dimension
    enc_depth = 3,                           # encoder depth
    dec_dim = 768,                           # decoder model dimensions
    dec_depth = 12,                          # decoder depth
    dec_cross_attn_layers = (1, 3, 6, 9),    # decoder cross attention layers (with causal chunk cross attention)
    heads = 8,                               # attention heads
    dim_head = 64,                           # dimension per head
    dec_attn_dropout = 0.25,                 # decoder attention dropout
    dec_ff_dropout = 0.25                    # decoder feedforward dropout
).cuda()

wrapper = TrainingWrapper(
    retro = retro,                                 # path to retro instance
    knn = 2,                                       # knn (2 in paper was sufficient)
    chunk_size = 64,                               # chunk size (64 in paper)
    documents_path = './text_folder',              # path to folder of text
    glob = '**/*.txt',                             # text glob
    chunks_memmap_path = './train.chunks.dat',     # path to chunks
    seqs_memmap_path = './train.seq.dat',          # path to sequence data
    doc_ids_memmap_path = './train.doc_ids.dat',   # path to document ids per chunk (used for filtering neighbors belonging to same document)
    max_chunks = 1_000_000,                        # maximum cap to chunks
    max_seqs = 100_000,                            # maximum seqs
    knn_extra_neighbors = 100,                     # num extra neighbors to fetch
    max_index_memory_usage = '100m',
    current_memory_available = '1G'
)

# get the dataloader and optimizer (AdamW with all the correct settings)

train_dl = iter(wrapper.get_dataloader(batch_size = 2, shuffle = True))
optim = wrapper.get_optimizer(lr = 3e-4, wd = 0.01)

# now do your training
# ex. one gradient step

seq, retrieved = map(lambda t: t.cuda(), next(train_dl))

# seq       - (2, 2049)         - 1 extra token since split by seq[:, :-1], seq[:, 1:]
# retrieved - (2, 32, 2, 128)   - 128 since chunk + continuation, each 64 tokens

loss = retro(
    seq,
    retrieved,
    return_loss = True
)

# one gradient step

loss.backward()
optim.step()
optim.zero_grad()

# do above for many steps, then ...

# encode prompt
from transformers import AutoTokenizer

tokenizer = AutoTokenizer.from_pretrained("bert-base-cased")

prompt_str = "The movie Dune was released in"

prompt_ids = tokenizer(prompt_str)['input_ids'][1:-1]

prompt = torch.tensor([prompt_ids])

sampled = wrapper.generate(prompt, filter_thres = 0.9, temperature = 1.0)

# decode sample
decoded = tokenizer.decode(sampled.tolist()[0])

print(decoded)

The code in the notebook for training several times is probably needed for good results though.

[aakashgoel12]

23 contains a notebook with a good example.

I think putting it together with the README instructions looks like this:

import torch
from retro_pytorch import RETRO, TrainingWrapper

# instantiate RETRO, fit it into the TrainingWrapper with correct settings

retro = RETRO(
    max_seq_len = 2048,                      # max sequence length
    enc_dim = 896,                           # encoder model dimension
    enc_depth = 3,                           # encoder depth
    dec_dim = 768,                           # decoder model dimensions
    dec_depth = 12,                          # decoder depth
    dec_cross_attn_layers = (1, 3, 6, 9),    # decoder cross attention layers (with causal chunk cross attention)
    heads = 8,                               # attention heads
    dim_head = 64,                           # dimension per head
    dec_attn_dropout = 0.25,                 # decoder attention dropout
    dec_ff_dropout = 0.25                    # decoder feedforward dropout
).cuda()

wrapper = TrainingWrapper(
    retro = retro,                                 # path to retro instance
    knn = 2,                                       # knn (2 in paper was sufficient)
    chunk_size = 64,                               # chunk size (64 in paper)
    documents_path = './text_folder',              # path to folder of text
    glob = '**/*.txt',                             # text glob
    chunks_memmap_path = './train.chunks.dat',     # path to chunks
    seqs_memmap_path = './train.seq.dat',          # path to sequence data
    doc_ids_memmap_path = './train.doc_ids.dat',   # path to document ids per chunk (used for filtering neighbors belonging to same document)
    max_chunks = 1_000_000,                        # maximum cap to chunks
    max_seqs = 100_000,                            # maximum seqs
    knn_extra_neighbors = 100,                     # num extra neighbors to fetch
    max_index_memory_usage = '100m',
    current_memory_available = '1G'
)

# get the dataloader and optimizer (AdamW with all the correct settings)

train_dl = iter(wrapper.get_dataloader(batch_size = 2, shuffle = True))
optim = wrapper.get_optimizer(lr = 3e-4, wd = 0.01)

# now do your training
# ex. one gradient step

seq, retrieved = map(lambda t: t.cuda(), next(train_dl))

# seq       - (2, 2049)         - 1 extra token since split by seq[:, :-1], seq[:, 1:]
# retrieved - (2, 32, 2, 128)   - 128 since chunk + continuation, each 64 tokens

loss = retro(
    seq,
    retrieved,
    return_loss = True
)

# one gradient step

loss.backward()
optim.step()
optim.zero_grad()

# do above for many steps, then ...

# encode prompt
from transformers import AutoTokenizer

tokenizer = AutoTokenizer.from_pretrained("bert-base-cased")

prompt_str = "The movie Dune was released in"

prompt_ids = tokenizer(prompt_str)['input_ids'][1:-1]

prompt = torch.tensor([prompt_ids])

sampled = wrapper.generate(prompt, filter_thres = 0.9, temperature = 1.0)

# decode sample
decoded = tokenizer.decode(sampled.tolist()[0])

print(decoded)

The code in the notebook for training several times is probably needed for good results though.

@filipesilva Can you please share notebook which you are referencing, its not accessible. or if you can share code for training multiple epochs, will be really very helpful. Thanks

[filipesilva]

@aakashgoel12 looks like the notebook that was in #23 is not there anymore. I don't have a copy of it, unfortunately. All the code I have is what I put in the comment.

[aakashgoel12]

@aakashgoel12 looks like the notebook that was in #23 is not there anymore. I don't have a copy of it, unfortunately. All the code I have is what I put in the comment.

Thanks @filipesilva. Can you please check if what I have written below is correct or need some modification. Thanks in advance.

num_epochs=3
train_dl = iter(wrapper.get_dataloader(batch_size = 4, shuffle = True))
for epoch in range(num_epochs):
    counter=0    
    for batch in tqdm(train_dl):
        seq, retrieved = map(lambda t: t.cuda(), batch)
        loss = retro(
            seq,
            retrieved,
            return_loss = True)
        # one gradient step
        loss.backward()
        optim.step()
        optim.zero_grad()
        if counter%10==0:
            print("Epoch:{}, BatchNo:{}, Loss:{}".format(epoch, counter, loss))
        counter+=1
    print("After epoch - {}, loss: {}".format(epoch,loss))

[filipesilva]

I really can't tell 😅 I only played around with this a couple of months ago and never really tried again.

[yerinNam]

hello documents_path = './text_folder', # path to folder of text glob = '*/.txt', # text glob chunks_memmap_path = './train.chunks.dat', # path to chunks seqs_memmap_path = './train.seq.dat', # path to sequence data doc_ids_memmap_path = './train.doc_ids.dat',

Is this in the path retro? Or what dataset is it?