prepare for knocking out inference logic over the weekend, last commit for this project for the day

Author: lucidrains

native_sparse_attention_pytorch/transformer.py

@@ -1,8 +1,11 @@
 import torch
-from torch import nn
+from torch import nn, Tensor
 import torch.nn.functional as F
 from torch.nn import Module, ModuleList, Linear, RMSNorm
 
+from math import ceil
+from tqdm import tqdm
+
 from einops import rearrange, repeat
 from einops.layers.torch import Rearrange
 
@@ -38,6 +41,25 @@ def default(v, d):
 def at_most_one_of(*bools):
     return sum([*map(int, bools)]) <= 1
 
+# sampling helpers
+
+def log(t, eps = 1e-20):
+    return torch.log(t.clamp(min = eps))
+
+def gumbel_noise(t):
+    noise = torch.zeros_like(t).uniform_(0, 1)
+    return -log(-log(noise))
+
+def gumbel_sample(t, temperature = 1., dim = -1, keepdim = True):
+    return ((t / max(temperature, 1e-10)) + gumbel_noise(t)).argmax(dim = dim, keepdim = keepdim)
+
+def top_k(logits, thres = 0.9):
+    k = ceil((1 - thres) * logits.shape[-1])
+    val, ind = torch.topk(logits, k)
+    probs = torch.full_like(logits, float('-inf'))
+    probs.scatter_(-1, ind, val)
+    return probs
+
 # attention
 
 class Attention(Module):
@@ -178,6 +200,31 @@ def __init__(
         self.norm = RMSNorm(dim)
         self.to_logits = Linear(dim, num_tokens, bias = False)
 
+    def sample(
+        self,
+        prompt: Tensor,
+        seq_len: int,
+        temperature = 1.,
+        filter_thres = 0.9,
+    ):
+        prompt_seq_len, out = prompt.shape[-1], prompt.clone()
+        sample_num_times = max(0, seq_len - prompt_seq_len)
+
+        for _ in tqdm(range(sample_num_times)):
+            logits = self.forward(
+                out,
+                disable_flex = True,
+                disable_triton_kernel = True
+            )
+
+            logits = logits[:, -1]
+            logits = top_k(logits, thres = filter_thres)
+            sample = gumbel_sample(logits, temperature = temperature, dim = -1)
+
+            out = torch.cat((out, sample), dim = -1)
+
+        return out[..., prompt_seq_len:]
+
     def forward(
         self,
         ids,

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "native-sparse-attention-pytorch"
-version = "0.0.55"
+version = "0.0.56"
 description = "Native Sparse Attention"
 authors = [
     { name = "Phil Wang", email = "lucidrains@gmail.com" }

train.py

@@ -69,50 +69,6 @@ def decode_token(token):
 def decode_tokens(tokens):
     return "".join(list(map(decode_token, tokens)))
 
-# sampling helpers
-
-def log(t, eps = 1e-20):
-    return torch.log(t.clamp(min = eps))
-
-def gumbel_noise(t):
-    noise = torch.zeros_like(t).uniform_(0, 1)
-    return -log(-log(noise))
-
-def gumbel_sample(t, temperature = 1., dim = -1, keepdim = True):
-    return ((t / max(temperature, 1e-10)) + gumbel_noise(t)).argmax(dim = dim, keepdim = keepdim)
-
-def top_k(logits, thres = 0.9):
-    k = math.ceil((1 - thres) * logits.shape[-1])
-    val, ind = torch.topk(logits, k)
-    probs = torch.full_like(logits, float('-inf'))
-    probs.scatter_(-1, ind, val)
-    return probs
-
-def base_decoding(
-    net,
-    prompt: Tensor,
-    seq_len: int,
-    temperature = 1.,
-    filter_thres = 0.9,
-):
-    prompt_seq_len, out = prompt.shape[-1], prompt.clone()
-    sample_num_times = max(0, seq_len - prompt_seq_len)
-
-    for _ in tqdm(range(sample_num_times)):
-        logits = net(
-            out,
-            disable_flex = True,
-            disable_triton_kernel = True
-        )
-
-        logits = logits[:, -1]
-        logits = top_k(logits, thres = filter_thres)
-        sample = gumbel_sample(logits, temperature = temperature, dim = -1)
-
-        out = torch.cat((out, sample), dim = -1)
-
-    return out[..., prompt_seq_len:]
-
 # printing
 
 if USE_TRITON_NSA:
@@ -231,7 +187,7 @@ def __getitem__(self, index):
 
         prompt = inp[None, ...]
 
-        sampled = base_decoding(model, prompt, GENERATE_LENGTH)
+        sampled = model.sample(prompt, GENERATE_LENGTH)
 
         base_decode_output = decode_tokens(sampled[0])