From af5a2996234768921b81d96ffaae00cb88229862 Mon Sep 17 00:00:00 2001
From: flu0r1ne <flu0r1ne@flu0r1ne.net>
Date: Wed, 1 Nov 2023 20:46:01 -0500
Subject: Initial commit

---
 llama/llm.py | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 llama/llm.py

(limited to 'llama/llm.py')

diff --git a/llama/llm.py b/llama/llm.py
new file mode 100644
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--- /dev/null
+++ b/llama/llm.py
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+"""
+LLM provides a generalized interface for autoregressive
+next-word prediction models. The class can be utilized for tasks such as text
+sampling and probability prediction over a vocabulary.
+"""
+
+import torch
+from torch import nn
+
+class LLM(nn.Module):
+    """
+    LLM provides a generalized interface for autoregressive
+    next-word prediction models. The class can be utilized for tasks such as text
+    sampling and probability prediction over a vocabulary.
+
+    Attributes:
+        context_length (int): Length of the context window for the
+                              autoregressive model.  Default is -1, which
+                              indicates that this needs to be set.
+
+        max_batch_size (int): The maximum size of a batch that can be processed.
+                              Default is -1, which indicates that this needs to
+                              be set.
+
+        vocab_size (int): The size of the vocabulary used in the model.
+                          Default is -1, which indicates that this needs to
+                          be set.
+
+        padding_idx (int): The index used for padding in mixed-length batches.
+                           Default is -1, which indicates that this needs to be
+                           set.
+
+        eos_token (int): Token index that signifies the end of a sequence during
+                         auto-regressive generation. Default is -1, which
+                         indicates that this needs to be set.
+    """
+
+    context_length = -1
+    max_batch_size = -1
+    vocab_size = -1
+    padding_idx = -1
+    eos_token = -1
+
+    def forward(self, context: torch.Tensor, cur_pos: int = 0) -> torch.Tensor:
+        """
+        Computes the log probabilities of the next token given a sequence of
+        tokens as context.
+
+        Args:
+            context (torch.Tensor): A tensor of shape (batch_size, context_length)
+                                   containing token ids. These tokens serve as the
+                                   context for predicting the next token.
+
+            cur_pos (int, optional): The position at which to start the
+                                       prediction. If cur_pos is not zero,
+                                       the internal cache (if available) will
+                                       be used to speed up predictions.
+                                       Defaults to 0.
+
+        Returns:
+            torch.Tensor: A tensor of shape (batch_size, vocab_size) containing
+                          the log probabilities of the next token given the
+                          context.
+
+        Examples:
+            # Predict the next token for a sequence [1, 2, 3]
+            log_probs = llm(torch.tensor([[1, 2, 3]], dtype=torch.long), 0)
+
+            # Predict the next token for a sequence [1, 2, 3, 4, 5] using the
+            # cache starting at position 3
+            log_probs = llm(torch.tensor([[4, 5]], dtype=torch.long), 3)
+        """
+
+        raise NotImplementedError()
-- 
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