[elpa] externals/llm ad76cff80b 01/34: Initial checkin of the llm package for emacs.

[Andrew Hyatt]

branch: externals/llm
commit ad76cff80b56ddf1c310eb2ec78f6547e39117de
Author: Andrew Hyatt <ahyatt@gmail.com>
Commit: Andrew Hyatt <ahyatt@gmail.com>

    Initial checkin of the llm package for emacs.
---
 .gitignore    |   2 +
 COPYING       | 674 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 llm-openai.el | 140 ++++++++++++
 llm-tester.el |  80 +++++++
 llm-vertex.el | 139 ++++++++++++
 llm.el        | 114 ++++++++++
 6 files changed, 1149 insertions(+)

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000..257c9f7d33
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.elc
+*-autoloads.el
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000000..f288702d2f
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
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+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/llm-openai.el b/llm-openai.el
new file mode 100644
index 0000000000..ad1a2e20c4
--- /dev/null
+++ b/llm-openai.el
@@ -0,0 +1,140 @@
+;;; llm-openai.el --- llm module for integrating with Open AI -*- 
lexical-binding: t -*-
+
+;; Copyright (c) 2023  Andrew Hyatt <ahyatt@gmail.com>
+
+;; Author: Andrew Hyatt <ahyatt@gmail.com>
+;; Homepage: https://github.com/ahyatt/llm
+;; Package-Requires: ((request "0.3.3") (emacs "28.1"))
+;; Package-Version: 0.1
+;; Keywords: outlines, hypermedia
+;; SPDX-License-Identifier: GPL-3.0-or-later
+;;
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation; either version 3 of the
+;; License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;; This file implements the llm functionality defined in llm.el, for Open AI's
+;; API.
+
+;;; Code:
+
+(require 'cl-lib)
+(require 'request)
+(require 'json)
+
+(defgroup llm-openai nil
+  "LLM implementation for Open AI."
+  :group 'llm)
+
+(defcustom llm-openai-example-prelude "Examples of how you should respond 
follow."
+  "The prelude to use for examples in Open AI chat prompts."
+  :type 'string
+  :group 'llm-openai)
+
+(cl-defstruct llm-openai
+  "A structure for holding information needed by Open AI's API.
+
+KEY is the API key for Open AI, which is required.
+
+CHAT-MODEL is the model to use for chat queries. If unset, it
+will use a reasonable default.
+
+EMBEDDING-MODEL is the model to use for embeddings.  If unset, it
+will use a reasonable default."
+  key chat-model embedding-model)
+
+(cl-defmethod llm-embedding ((provider llm-openai) string)
+  (unless (llm-openai-key provider)
+    (error "To call Open AI API, provide the ekg-embedding-api-key"))
+  (let ((resp (request "https://api.openai.com/v1/embeddings";
+                :type "POST"
+                :headers `(("Authorization" . ,(format "Bearer %s" 
ekg-embedding-api-key))
+                           ("Content-Type" . "application/json"))
+                :data (json-encode `(("input" . ,string) ("model" . ,(or 
(llm-openai-embedding-model provider) "text-embedding-ada-002"))))
+                :parser 'json-read
+                :error (cl-function (lambda (&key error-thrown data 
&allow-other-keys)
+                                      (error (format "Problem calling Open AI: 
%s, type: %s message: %s"
+                                                     (cdr error-thrown)
+                                                     (assoc-default 'type 
(cdar data))
+                                                     (assoc-default 'message 
(cdar data))))))
+                :timeout 2
+                :sync t)))
+    (cdr (assoc 'embedding (aref (cdr (assoc 'data (request-response-data 
resp))) 0)))))
+
+(defun llm-openai--chat-response (prompt &optional return-json-spec)
+  "Main method to send a PROMPT as a chat prompt to Open AI.
+RETURN-JSON-SPEC, if specified, is a JSON spec to return from the
+Open AI API."
+  (unless (llm-openai-key provider)
+    (error "To call Open AI API, the key must have been set"))
+  (let (request-alist system-prompt)
+    (when (llm-chat-prompt-context prompt)
+      (setq system-prompt (llm-chat-prompt-context prompt)))
+    (when (llm-chat-prompt-examples prompt)
+      (setq system-prompt
+            (concat (if system-prompt (format "\n%s\n" system-prompt) "")
+                    llm-openai-example-prelude
+                    "\n"
+                    (mapconcat (lambda (example)
+                                 (format "User: %s\nAssistant: %s"
+                                         (car example)
+                                         (cdr example)))
+                               (llm-chat-prompt-examples prompt) "\n"))))
+    (when system-prompt
+      (push (make-llm-chat-prompt-interaction :role 'system :content 
system-prompt)
+            (llm-chat-prompt-interactions prompt)))
+    (push `("messages" . ,(mapcar (lambda (p)
+                                    `(("role" . ,(pcase 
(llm-chat-prompt-interaction-role p)
+                                                   ('user "user")
+                                                   ('system "system")
+                                                   ('assistant "assistant")))
+                                      ("content" . ,(string-trim 
(llm-chat-prompt-interaction-content p)))))
+                                  (llm-chat-prompt-interactions prompt)))
+          request-alist)
+    (push `("model" . ,(or (llm-openai-chat-model provider) 
"gpt-3.5-turbo-0613")) request-alist)
+    (when (llm-chat-prompt-temperature prompt)
+      (push `("temperature" . ,(/ (llm-chat-prompt-temperature prompt) 2.0)) 
request-alist))
+    (when (llm-chat-prompt-max-tokens prompt)
+      (push `("max_tokens" . ,(llm-chat-prompt-max-tokens prompt)) 
request-alist))
+    (when return-json-spec
+      (push `("functions" . ((("name" . "output")
+                              ("parameters" . ,return-json-spec))))
+            request-alist)
+      (push '("function_call" . (("name" . "output"))) request-alist))
+    
+    (let* ((resp (request "https://api.openai.com/v1/chat/completions";
+                  :type "POST"
+                  :headers `(("Authorization" . ,(format "Bearer %s" 
(llm-openai-key provider)))
+                             ("Content-Type" . "application/json"))
+                  :data (json-encode request-alist)
+                  :parser 'json-read
+                  :error (cl-function (lambda (&key error-thrown data 
&allow-other-keys)
+                                        (error (format "Problem calling Open 
AI: %s, type: %s message: %s"
+                                                       (cdr error-thrown)
+                                                       (assoc-default 'type 
(cdar data))
+                                                       (assoc-default 'message 
(cdar data))))))
+                  :sync t)))
+      (let ((result (cdr (assoc 'content (cdr (assoc 'message (aref (cdr 
(assoc 'choices (request-response-data resp))) 0))))))
+            (func-result (cdr (assoc 'arguments (cdr (assoc 'function_call 
(cdr (assoc 'message (aref (cdr (assoc 'choices (request-response-data resp))) 
0)))))))))        
+        (or func-result result)))))
+
+(cl-defmethod llm-chat-response ((provider llm-openai) prompt)
+  (llm-openai--chat-response prompt nil))
+
+(cl-defmethod llm-chat-structured-response ((provider llm-openai) prompt spec)
+  (llm-openai--chat-response prompt spec))
+
+
+(provide 'llm-openai)
+
+;;; llm-openai.el ends here
diff --git a/llm-tester.el b/llm-tester.el
new file mode 100644
index 0000000000..53938ae721
--- /dev/null
+++ b/llm-tester.el
@@ -0,0 +1,80 @@
+;;; llm-tester.el --- Helpers for testing LLM implementation
+
+;; Copyright (c) 2023  Andrew Hyatt <ahyatt@gmail.com>
+
+;; Author: Andrew Hyatt <ahyatt@gmail.com>
+;; SPDX-License-Identifier: GPL-3.0-or-later
+;;
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation; either version 3 of the
+;; License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;; This file contains functions to help test the LLM implementation. Because of
+;; LLM's inherent randomness, it isn't possible to have normal unit tests.
+;; Humans should be looking at these results and seeing if they make sense.
+;; However, we can test a few things automatically, including making sure that
+;; no errors are thrown normally, or errors are thrown correctly when they
+;; should be.
+;;
+;; The normal way to use this is to create a provider for each LLM you have
+;; access to, and run `llm-tester-all' on it. Or, you can test individual parts
+;; with their respective functions.'
+;;
+;; Both normal output and errors are output to the `*Messages*' buffer.
+
+(require 'llm)
+
+(defun llm-tester-embedding (provider)
+  "Test that PROVIDER can provide embeddings."
+  (condition-case nil
+      (let ((embedding (llm-embedding provider "This is a test.")))
+        (if embedding
+            (if (eq (type-of embedding) 'vector)
+                (if (> (length embedding) 0)
+                    (message "SUCCESS: Provider %s provided an embedding of 
length %d.  First 10 values: %S" (type-of provider)
+                             (length embedding)
+                             (seq-subseq embedding 0 (min 10 (length 
embedding))))
+                  (message "ERROR: Provider %s returned an empty embedding" 
(type-of provider))))
+          (message "ERROR: Provider %s did not return any embedding" (type-of 
provider))))
+    (not-implemented (message "ERROR: Provider %s could not provide 
embeddings." (type-of provider)))))
+
+(defun llm-tester-chat (provider)
+  "Test that PROVIDER can interact with the LLM chat."
+  (condition-case nil
+      (let ((response (llm-chat-response 
+                   provider
+                   (make-llm-chat-prompt
+                    :interactions (list
+                                   (make-llm-chat-prompt-interaction
+                                    :role 'user
+                                    :content "Tell me a random cool feature of 
emacs."))
+                    :context "You must answer all questions as if you were the 
butler Jeeves from Jeeves and Wooster.  Start all interactions with the phrase, 
'Very good, sir.'"
+                    :examples '(("Tell me the capital of France." . "Very 
good, sir.  The capital of France is Paris, which I expect you to be familiar 
with, since you were just there last week with your Aunt Agatha.")
+                                ("Could you take me to my favorite place?" . 
"Very good, sir.  I believe you are referring to the Drone's Club, which I will 
take you to after you put on your evening attire."))
+                    :temperature 0.5
+                    :max-tokens 100))))
+        (if response
+            (if (> (length response) 0)
+                (message "SUCCESS: Provider %s provided a response %s" 
(type-of provider) response)
+              (message "ERROR: Provider %s returned an empty response" 
(type-of provider)))
+          (message "ERROR: Provider %s did not return any response" (type-of 
provider))))
+    (not-implemented (message "ERROR: Provider %s could not get a chat." 
(type-of provider)))))
+
+(defun llm-tester-all (provider)
+  "Test all llm functionality for PROVIDER."
+  (llm-tester-embedding provider)
+  (llm-tester-chat provider))
+
+(provide 'llm-tester)
+
+;;; llm-tester.el ends here
diff --git a/llm-vertex.el b/llm-vertex.el
new file mode 100644
index 0000000000..22043a97ab
--- /dev/null
+++ b/llm-vertex.el
@@ -0,0 +1,139 @@
+;;; llm-vertex.el --- LLM implementation of Google Cloud Vertex AI -*- 
lexical-binding: t -*-
+
+;; Copyright (c) 2023  Andrew Hyatt <ahyatt@gmail.com>
+
+;; Author: Andrew Hyatt <ahyatt@gmail.com>
+;; Homepage: https://github.com/ahyatt/llm
+;; Package-Requires: ((request "0.3.3") (emacs "28.1"))
+;; Package-Version: 0.1
+;; Keywords: outlines, hypermedia
+;; SPDX-License-Identifier: GPL-3.0-or-later
+;;
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation; either version 3 of the
+;; License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;; This file implements the llm functionality defined in llm.el, for Google
+;; Cloud Vertex AI.
+
+(require 'cl-lib)
+(require 'llm)
+
+(defgroup llm-vertex nil
+  "LLM implementation for Google Cloud Vertex AI."
+  :group 'llm)
+
+(defcustom llm-vertex-gcloud-binary "gcloud"
+  "The executable to use for the gcloud binary.
+If the binary is not in the PATH, the full path must be specified."
+  :type 'file
+  :group 'llm-vertex)
+
+(defcustom llm-vertex-gcloud-region "us-central1"
+  "The gcloud region to use to connect to Vertex AI."
+  :type 'string
+  :group 'llm-vertex)
+
+(cl-defstruct llm-vertex
+  "A struct representing a Vertex AI client.
+
+KEY is the temporary API key for the Vertex AI. It is required to
+be populated before any call.
+
+CHAT-MODEL is the name of the chat model to use. If unset, will use a 
reasonable default.
+
+EMBEDDING-MODEL is the name of the embedding model to use. If unset, will use 
a reasonable default.
+
+KEY-GENTIME keeps track of when the key was generated, because the key must be 
regenerated every hour."
+  key
+  project
+  embedding-model
+  chat-model
+  key-gentime)
+
+(defun llm-vertex-refresh-key (provider)
+  "Refresh the key in the vertex PROVIDER, if needed."
+  (unless (and (llm-vertex-key provider)
+               (> (* 60 60)
+                  (float-time (time-subtract (current-time) (or 
(llm-vertex-key-gentime provider) 0)))))
+    (setf (llm-vertex-key provider)
+          (string-trim
+           (shell-command-to-string (concat llm-vertex-gcloud-binary " auth 
print-access-token"))))
+    (setf (llm-vertex-key-gentime provider) (current-time))))
+
+(cl-defmethod llm-embedding ((provider llm-vertex) string)
+  (llm-vertex-refresh-key provider)
+  (let ((resp (request (format 
"https://%s-aiplatform.googleapis.com/v1/projects/%s/locations/%s/publishers/google/models/%s:predict";
+                               llm-vertex-gcloud-region
+                               (llm-vertex-project provider)
+                               llm-vertex-gcloud-region
+                               (or (llm-vertex-embedding-model provider) 
"textembedding-gecko"))
+                :type "POST"
+                :headers `(("Authorization" . ,(format "Bearer %s" 
(llm-vertex-key provider)))
+                           ("Content-Type" . "application/json"))
+                :data (json-encode `(("instances" . [(("content" . 
,string))])))
+                :parser 'json-read
+                :error (cl-function (lambda (&key error-thrown data 
&allow-other-keys)
+                                      (error (format "Problem calling GCloud 
AI: %s"
+                                                     (cdr error-thrown)))))
+                :sync t)))
+    (cdr (assoc 'values (cdr (assoc 'embeddings (aref (cdr (assoc 'predictions 
(request-response-data resp))) 0)))))))
+
+(cl-defmethod llm-chat-response ((provider llm-vertex) prompt)
+  (llm-vertex-refresh-key provider)
+  (let ((request-alist))
+    (when (llm-chat-prompt-context prompt)
+      (push `("context" . ,(llm-chat-prompt-context prompt)) request-alist))
+    (when (llm-chat-prompt-examples prompt)
+      (push `("examples" . ,(apply #'vector
+                                   (mapcar (lambda (example)
+                                      `(("input" . (("content" . ,(car 
example))))
+                                        ("output" . (("content" . ,(cdr 
example))))))
+                                           (llm-chat-prompt-examples prompt))))
+            request-alist))
+    (push `("messages" . ,(apply #'vector
+                                 (mapcar (lambda (interaction)
+                                           `(("author" . (pcase 
(llm-chat-prompt-interaction-role interaction)
+                                                           ('user "user")
+                                                           ('system (error 
"System role not supported"))
+                                                           ('assistant 
"assistant")))
+                                             ("content" . 
,(llm-chat-prompt-interaction-content interaction))))
+                                         (llm-chat-prompt-interactions 
prompt))))
+          request-alist)
+    (when (llm-chat-prompt-temperature prompt)
+      (push `("temperature" . ,(llm-chat-prompt-temperature prompt))
+            request-alist))
+    (when (llm-chat-prompt-max-tokens prompt)
+      (push `("max_tokens" . ,(llm-chat-prompt-max-tokens prompt)) 
request-alist))
+    (let ((resp (request (format 
"https://%s-aiplatform.googleapis.com/v1/projects/%s/locations/%s/publishers/google/models/%s:predict";
+                                   llm-vertex-gcloud-region
+                                   (llm-vertex-project provider)
+                                   llm-vertex-gcloud-region
+                                   (or (llm-vertex-chat-model provider) 
"chat-bison"))
+                      :type "POST"
+                      :headers `(("Authorization" . ,(format "Bearer %s" 
(llm-vertex-key provider)))
+                                 ("Content-Type" . "application/json"))
+                      :data (json-encode `(("instances" . [,request-alist])))
+                      :parser 'json-read
+                      :error (cl-function (lambda (&key error-thrown data 
&allow-other-keys)
+                                          (error (format "Problem calling 
GCloud AI: %s, status: %s message: %s (%s)"
+                                                           (cdr error-thrown)
+                                                           (assoc-default 
'status (assoc-default 'error data))
+                                                           (assoc-default 
'message (assoc-default 'error data))
+                                                           data))))
+                      :sync t)))
+      (cdr (assoc 'content (aref (cdr (assoc 'candidates (aref (cdr (assoc 
'predictions (request-response-data resp))) 0))) 0))))))
+
+(provide 'llm-vertex)
+
+;;; llm-vertex.el ends here
diff --git a/llm.el b/llm.el
new file mode 100644
index 0000000000..a88090306e
--- /dev/null
+++ b/llm.el
@@ -0,0 +1,114 @@
+;;; llm.el --- Interface to pluggable llm backends -*- lexical-binding: t -*-
+
+;; Copyright (c) 2023  Andrew Hyatt <ahyatt@gmail.com>
+
+;; Author: Andrew Hyatt <ahyatt@gmail.com>
+;; Homepage: https://github.com/ahyatt/llm
+;; Package-Requires: ((request "0.3.3") (emacs "28.1"))
+;; Package-Version: 0.1
+;; Keywords: outlines, hypermedia
+;; SPDX-License-Identifier: GPL-3.0-or-later
+;;
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation; either version 3 of the
+;; License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;; This file defines a generic interface for LLMs (large language models), and
+;; functionality they can provide. Not all LLMs will support all of these, but
+;; programs that want to integrate with LLMs can code against the interface, 
and
+;; users can then choose the LLMs they want to use. It's advisable to have the
+;; possibility of using multiple LLMs when that make sense for different
+;; functionality.
+;;
+;; Users should require this module and then the module of the LLM they want to
+;; use.
+;;
+;; Not all LLMs might be able to do everything, so clients need to catch any
+;; signals thrown with symbol `not-implemented', and surface an error to the
+;; user that the LLM they have chosen cannot be used for that functionality.
+
+;;; Code:
+
+(require 'cl-lib)
+
+(cl-defstruct llm-chat-prompt
+  "This stores all the information needed for a structured chat prompt.
+
+CONTEXT is a string given to the LLM as context for the entire
+interaction, such as instructions to the LLM on how to reply,
+persona, information on the user, or anything else that applies
+to the chat as a whole.  This is optional.
+
+EXAMPLES is a list of conses, where the car is an example
+inputs, and cdr is the corresponding example outputs.  This is optional.
+
+INTERACTIONS is a list message sent by either the llm or the
+user. It is a list of `llm-chat-prompt-interaction' objects. This
+is required.
+
+TEMPERATURE is a floating point number with a minimum of 0, and
+maximum of 1, which controls how predictable the result is, with
+0 being the most predicatable, and 1 being the most creative.
+This is not required.
+
+MAX-TOKENS is the maximum number of tokens to generate.  This is optional.
+"
+  context examples interactions temperature max-tokens)
+
+(cl-defstruct llm-chat-prompt-interaction
+  "This defines a single interaction given as part of a chat prompt.
+ROLE can a symbol, of either `user' or `assistant'."
+  role content)
+
+(cl-defgeneric llm-chat-response (provider prompt)
+  "Return a response to PROMPT from PROVIDER.
+PROMPT is a `llm-chat-prompt'. The response is a string."
+  (ignore provider prompt)
+  (signal 'not-implemented nil))
+
+(cl-defgeneric llm-embedding (provider string)
+  "Return a vector embedding of STRING from PROVIDER."
+  (ignore provider string)
+  (signal 'not-implemented nil))
+
+(cl-defgeneric llm-count-tokens (provider string)
+  "Return the number of tokens in STRING from PROVIDER.
+This may be an estimate if the LLM does not provide an exact
+count. Different providers might tokenize things in different
+ways."
+    (ignore provider)
+    (with-temp-buffer
+      (insert string)
+      (/ (* (count-words (point-min) (point-max)) 4) 3)))
+
+(defun llm-chat-prompt-to-text (prompt)
+  "Convert PROMPT `llm-chat-prompt' to a simple text.
+This should only be used for logging or debugging."
+  (format "Context: %s\nExamples: %s\nInteractions: %s\nTemperature: %f\nMax 
tokens: %d\n"
+          (llm-chat-prompt-context prompt)
+          (mapconcat (lambda (e) (format "User: %s\nResponse: %s" (car e) (cdr 
e)))
+                     (llm-chat-prompt-interactions prompt) "\n")
+          (mapconcat (lambda (i)
+               (format "%s: %s"
+                       (pcase (llm-chat-prompt-interaction-role i)
+                         ('user "User")
+                         ('system "System")
+                         ('assistant "Assistant"))
+                       (llm-chat-prompt-interaction-content i)))
+                     (llm-chat-prompt-interactions prompt) "\n")
+          (llm-chat-prompt-temperature prompt)
+          (llm-chat-prompt-max-tokens prompt)))
+
+(provide 'llm)
+
+;;; llm.el ends here