Fix #891 (#952)

Author: kddubey

llama_cpp/llama.py

@@ -214,6 +214,8 @@ class _LlamaModel:
     NOTE: For stability it's recommended you use the Llama class instead."""
 
     _llama_free_model = None
+    # NOTE: this must be "saved" here to avoid exceptions when calling __del__
+    suppress_stdout_stderr = suppress_stdout_stderr
 
     def __init__(
         self,
@@ -237,7 +239,7 @@ def __init__(
             )
 
     def __del__(self):
-        with suppress_stdout_stderr(disable=self.verbose):
+        with self.suppress_stdout_stderr(disable=self.verbose):
             if self.model is not None and self._llama_free_model is not None:
                 self._llama_free_model(self.model)
                 self.model = None
@@ -399,6 +401,8 @@ class _LlamaContext:
     NOTE: For stability it's recommended you use the Llama class instead."""
 
     _llama_free = None
+    # NOTE: this must be "saved" here to avoid exceptions when calling __del__
+    suppress_stdout_stderr = suppress_stdout_stderr
 
     def __init__(
         self,
@@ -419,7 +423,7 @@ def __init__(
             )
 
     def __del__(self):
-        with suppress_stdout_stderr(disable=self.verbose):
+        with self.suppress_stdout_stderr(disable=self.verbose):
             if self.ctx is not None and self._llama_free is not None:
                 self._llama_free(self.ctx)
                 self.ctx = None
@@ -650,6 +654,8 @@ def default_params():
 
 class _LlamaBatch:
     _llama_batch_free = None
+    # NOTE: this must be "saved" here to avoid exceptions when calling __del__
+    suppress_stdout_stderr = suppress_stdout_stderr
 
     def __init__(
         self, *, n_tokens: int, embd: int, n_seq_max: int, verbose: bool = True
@@ -667,7 +673,7 @@ def __init__(
             )
 
     def __del__(self):
-        with suppress_stdout_stderr(disable=self.verbose):
+        with self.suppress_stdout_stderr(disable=self.verbose):
             if self.batch is not None and self._llama_batch_free is not None:
                 self._llama_batch_free(self.batch)
                 self.batch = None