diff --git a/langfun/__init__.py b/langfun/__init__.py
index 66dec9ac..fe86affb 100644
--- a/langfun/__init__.py
+++ b/langfun/__init__.py
@@ -35,6 +35,8 @@
 PythonCode = coding.PythonCode
 
 from langfun.core import llms
+lm_cache = llms.cache.lm_cache
+
 from langfun.core import memories
 
 # Placeholder for Google-internal imports.
diff --git a/langfun/core/concurrent.py b/langfun/core/concurrent.py
index bc780ae1..62055adb 100644
--- a/langfun/core/concurrent.py
+++ b/langfun/core/concurrent.py
@@ -21,6 +21,7 @@
 
 from langfun.core import component
 import pyglove as pg
+from tqdm import auto as tqdm
 
 
 def with_context_access(func: Callable[..., Any]) -> Callable[..., Any]:
@@ -234,12 +235,14 @@ def concurrent_map(
     func: Callable[[Any], Any],
     parallel_inputs: Iterable[Any],
     *,
+    executor: concurrent.futures.ThreadPoolExecutor | None = None,
     max_workers: int = 32,
     ordered: bool = False,
+    show_progress: bool = False,
     timeout: int | None = None,
     silence_on_errors: Union[
         Type[Exception], Tuple[Type[Exception], ...], None
-    ] = RetryError,
+    ] = Exception,
     retry_on_errors: Union[
         Type[Exception],
         Tuple[Type[Exception], ...],
@@ -254,10 +257,13 @@ def concurrent_map(
   Args:
     func: A user function.
     parallel_inputs: The inputs for `func` which will be processed in parallel.
+    executor: Thread pool exeutor to pool work items. If None, a new thread pool
+      executor will be created for current execution.
     max_workers: The max number of workers.
     ordered: If True, the returned iterator will emit (input, output, error) in
       the order of the elements in `parallel_inputs`. Otherwise, elements that
       are finished earlier will be delivered first.
+    show_progress: If True, show progress on console.
     timeout: The timeout in seconds for processing each input. It is the total
       processing time for each input, even multiple retries take place. If None,
       there is no timeout.
@@ -298,11 +304,13 @@ def remaining_time():
       return None
     return time.time() - start_time
 
-  with concurrent.futures.ThreadPoolExecutor(
-      max_workers=max_workers
-  ) as executor:
+  executor = executor or concurrent.futures.ThreadPoolExecutor(
+      max_workers=max_workers)
+
+  with executor:
     future_to_job = {}
     pending_futures = []
+    total = 0
     for inputs in parallel_inputs:
       job = Job(func, inputs)
       future = executor.submit(
@@ -310,17 +318,33 @@ def remaining_time():
       )
       pending_futures.append(future)
       future_to_job[future] = job
+      total += 1
+
+    progress = tqdm.tqdm(total=total) if show_progress else None
+    def update_progress(success: int, failure: int) -> None:
+      if progress is not None:
+        completed = success + failure
+        progress.update(1)
+        progress.set_description(
+            'Success: %.2f%% (%d/%d), Failure: %.2f%% (%d/%d)'
+            % (success * 100.0 / completed, success, completed,
+               failure * 100.0 / completed, failure, completed))
 
     remaining_futures = []
+    success, failure = 0, 0
     if ordered:
       for i, future in enumerate(pending_futures):
         try:
           _ = future.result(timeout=remaining_time())
           job = future_to_job[future]
-          if job.error is not None and not (
-              silence_on_errors and isinstance(job.error, silence_on_errors)
-          ):
-            raise job.error
+          if job.error is not None:
+            failure += 1
+            if not (
+                silence_on_errors and isinstance(job.error, silence_on_errors)):
+              raise job.error
+          else:
+            success += 1
+          update_progress(success, failure)
           del future_to_job[future]
           yield job.arg, job.result, job.error
         except concurrent.futures.TimeoutError:
@@ -332,10 +356,15 @@ def remaining_time():
       ):
         job = future_to_job[future]
         del future_to_job[future]
-        if job.error is not None and not (
-            silence_on_errors and isinstance(job.error, silence_on_errors)
-        ):
-          raise job.error   # pylint: disable=g-doc-exception
+        if job.error is not None:
+          failure += 1
+          if not (
+              silence_on_errors and isinstance(job.error, silence_on_errors)
+          ):
+            raise job.error   # pylint: disable=g-doc-exception
+        else:
+          success += 1
+        update_progress(success, failure)
         yield job.arg, job.result, job.error
       remaining_futures = future_to_job
 
@@ -346,3 +375,6 @@ def remaining_time():
         future.cancel()
         job.error = TimeoutError(f'Execution time exceeds {timeout} seconds.')
       yield job.arg, job.result, job.error
+
+    if progress is not None:
+      progress.close()
diff --git a/langfun/core/concurrent_test.py b/langfun/core/concurrent_test.py
index 5722fc92..f7301753 100644
--- a/langfun/core/concurrent_test.py
+++ b/langfun/core/concurrent_test.py
@@ -173,7 +173,7 @@ def fun(x):
       return x**2
 
     with component.context(y=2):
-      it = concurrent.concurrent_map(fun, [1, 2, 3])
+      it = concurrent.concurrent_map(fun, [1, 2, 3], silence_on_errors=KeyError)
       self.assertEqual(next(it), (1, 1, None))
       with self.assertRaises(ValueError):
         _ = next(it)
@@ -276,7 +276,8 @@ def fun(x):
       return x**2
 
     with component.context(y=2):
-      it = concurrent.concurrent_map(fun, [1, 2, 3], ordered=True)
+      it = concurrent.concurrent_map(
+          fun, [1, 2, 3], ordered=True, silence_on_errors=KeyError)
       self.assertEqual(next(it)[1], 1)
 
       with self.assertRaises(ValueError):
@@ -302,6 +303,24 @@ def fun(x):
           ],
       )
 
+  def test_concurrent_map_with_showing_progress(self):
+    def fun(x):
+      return x
+
+    self.assertEqual(
+        [
+            (i, o)
+            for i, o, _ in concurrent.concurrent_map(
+                fun, [1, 2, 3], ordered=True, show_progress=True
+            )
+        ],
+        [
+            (1, 1),
+            (2, 2),
+            (3, 3),
+        ],
+    )
+
 
 if __name__ == '__main__':
   unittest.main()
diff --git a/langfun/core/langfunc_test.py b/langfun/core/langfunc_test.py
index 82c0cc8b..dfcd4d2a 100644
--- a/langfun/core/langfunc_test.py
+++ b/langfun/core/langfunc_test.py
@@ -94,7 +94,8 @@ def test_call(self):
         "LangFunc(template_str='Hello', clean=True, returns=None, "
         'lm=ExcitedEchoer(sampling_options=LMSamplingOptions(temperature=0.0, '
         'max_tokens=1024, n=1, top_k=40, top_p=None, random_seed=None), '
-        'cache=None, timeout=120.0, max_attempts=5, debug=False), '
+        'cache=ContextualAttribute(type=None, default=None), timeout=120.0, '
+        'max_attempts=5, debug=False), '
         'input_transform=None, output_transform=None)',
     )
 
diff --git a/langfun/core/language_model.py b/langfun/core/language_model.py
index ee1448ad..62dde882 100644
--- a/langfun/core/language_model.py
+++ b/langfun/core/language_model.py
@@ -54,16 +54,28 @@ class LMSamplingResult(pg.Object):
 class LMSamplingOptions(component.Component):
   """Language model sampling options."""
 
-  temperature: Annotated[float, 'Model temperature between [0, 1.0].'] = 0.0
+  temperature: Annotated[
+      float,
+      (
+          'Model temperature, which is usually between 0 and 1.0. '
+          'OpenAI models have temperature range from 0.0 to 2.0.'
+      )
+  ] = 0.0
   max_tokens: Annotated[int, 'Per example max tokens to generate.'] = 1024
   n: Annotated[int | None, 'Max number of samples to return.'] = 1
-  top_k: Annotated[int | None, 'Top k tokens to sample the next token.'] = 40
+  top_k: Annotated[
+      int | None,
+      (
+          'Top k tokens to sample the next token. '
+          'Not applicable to OpenAI models.'
+      )
+  ] = 40
   top_p: Annotated[
       float | None,
       (
           'Only sample the next token from top N tokens whose accumulated '
-          'probability // mass <= p. Not applicable to OpenAI models and '
-          'BigBard.'
+          'probability // mass <= p. For OpenAI models, set `temperature` or '
+          '`top_p` but not both.'
       ),
   ] = None
   random_seed: Annotated[
@@ -116,7 +128,7 @@ class LanguageModel(component.Component):
       (
           'Sampling cache. If None, no cache will be used.'
       )
-  ] = None
+  ] = component.contextual(default=None)
 
   timeout: Annotated[
       float | None, 'Timeout in seconds. If None, there is no timeout.'
diff --git a/langfun/core/llms/cache/__init__.py b/langfun/core/llms/cache/__init__.py
index b5f4717a..c5470e99 100644
--- a/langfun/core/llms/cache/__init__.py
+++ b/langfun/core/llms/cache/__init__.py
@@ -20,6 +20,7 @@
 from langfun.core.llms.cache.base import LMCacheEntry
 
 from langfun.core.llms.cache.in_memory import InMemory
+from langfun.core.llms.cache.in_memory import lm_cache
 
 
 # pylint: enable=g-bad-import-order
diff --git a/langfun/core/llms/cache/in_memory.py b/langfun/core/llms/cache/in_memory.py
index a2bded3c..88871a99 100644
--- a/langfun/core/llms/cache/in_memory.py
+++ b/langfun/core/llms/cache/in_memory.py
@@ -14,7 +14,9 @@
 """In-memory LM cache."""
 
 import collections
+import contextlib
 from typing import Annotated, Any, Iterator
+import langfun.core as lf
 from langfun.core.llms.cache import base
 import pyglove as pg
 
@@ -110,3 +112,30 @@ def save(self, path: str) -> None:
       entries = [dict(k=k, v=v) for k, v in self.items(model_id)]
       records.append(dict(model_id=model_id, entries=entries))
     pg.save(records, path)
+
+
+@contextlib.contextmanager
+def lm_cache(
+    load: str | None = None,
+    save: str | None = None,
+) -> Iterator[InMemory]:
+  """Context manager to enable cache for LMs under the context.
+
+  If LMs under the context manager have explicitly specified cache, they will
+  use their own cache. Otherwise they will use the cache created by the context
+  manager.
+
+  Args:
+    load: If not None, JSON file to load the cache.
+    save: If not None, JSON file to save the cache when context manager exits.
+
+  Yields:
+    A cache object created.
+  """
+  c = InMemory(load)
+  try:
+    with lf.context(cache=c):
+      yield c
+  finally:
+    if save:
+      c.save(save)
diff --git a/langfun/core/llms/cache/in_memory_test.py b/langfun/core/llms/cache/in_memory_test.py
index 6aa6ecad..e2a2967e 100644
--- a/langfun/core/llms/cache/in_memory_test.py
+++ b/langfun/core/llms/cache/in_memory_test.py
@@ -189,5 +189,40 @@ def test_save_load(self):
     self.assertEqual(lm2('a'), 'a')
 
 
+class UseCacheTest(unittest.TestCase):
+
+  def test_lm_cache(self):
+    with in_memory.lm_cache() as c:
+      lm = fake.Echo()
+      self.assertIs(lm.cache, c)
+      lm = fake.Echo(cache=in_memory.InMemory())
+      self.assertIsNot(lm.cache, c)
+
+  def test_lm_cache_load_save(self):
+    pg.set_load_handler(pg.symbolic.default_load_handler)
+    pg.set_save_handler(pg.symbolic.default_save_handler)
+
+    cache = in_memory.InMemory()
+    lm = fake.StaticSequence(['1', '2', '3'], cache=cache)
+    self.assertEqual(lm('a'), '1')
+    self.assertEqual(lm('b'), '2')
+
+    tmp_dir = tempfile.gettempdir()
+    path1 = os.path.join(tmp_dir, 'memory1.json')
+    cache.save(path1)
+
+    path2 = os.path.join(tmp_dir, 'memory2.json')
+
+    with in_memory.lm_cache(load=path1, save=path2) as c1:
+      self.assertEqual(len(c1), 2)
+
+      lm = fake.StaticSequence(['4', '5', '6'])
+      self.assertEqual(lm('a'), '1')
+      self.assertEqual(lm('b'), '2')
+
+    with in_memory.lm_cache(load=path2, save=path2) as c2:
+      self.assertEqual(len(c2), 2)
+
+
 if __name__ == '__main__':
   unittest.main()
diff --git a/langfun/core/llms/openai.py b/langfun/core/llms/openai.py
index 47cb10d8..d9b04c0d 100644
--- a/langfun/core/llms/openai.py
+++ b/langfun/core/llms/openai.py
@@ -122,7 +122,7 @@ def _get_request_args(
     args['model' if self.is_chat_model else 'engine'] = self.model
 
     if options.top_p is not None:
-      args['top_p'] = options.top_k
+      args['top_p'] = options.top_p
     return args
 
   def _sample(self, prompts: list[lf.Message]) -> list[LMSamplingResult]:
diff --git a/langfun/core/llms/openai_test.py b/langfun/core/llms/openai_test.py
index cbcac703..479fe6fa 100644
--- a/langfun/core/llms/openai_test.py
+++ b/langfun/core/llms/openai_test.py
@@ -61,6 +61,39 @@ def test_model_id(self):
     self.assertEqual(
         openai.Gpt35(api_key='test_key').model_id, 'OpenAI(text-davinci-003)')
 
+  def test_get_request_args(self):
+    self.assertEqual(
+        openai.Gpt35(api_key='test_key', timeout=90.0)._get_request_args(
+            lf.LMSamplingOptions(
+                temperature=2.0,
+                n=2,
+                max_tokens=4096,
+                top_p=1.0)),
+        dict(
+            engine='text-davinci-003',
+            n=2,
+            temperature=2.0,
+            max_tokens=4096,
+            stream=False,
+            timeout=90.0,
+            top_p=1.0,
+        )
+    )
+    self.assertEqual(
+        openai.Gpt4(api_key='test_key')._get_request_args(
+            lf.LMSamplingOptions(
+                temperature=1.0,
+                n=1)),
+        dict(
+            model='gpt-4',
+            n=1,
+            temperature=1.0,
+            max_tokens=1024,
+            stream=False,
+            timeout=120.0,
+        )
+    )
+
   def test_call_completion(self):
     with mock.patch('openai.Completion.create') as mock_completion:
       mock_completion.side_effect = mock_completion_query
diff --git a/langfun/core/sampling.py b/langfun/core/sampling.py
index a9919847..2f0c026e 100644
--- a/langfun/core/sampling.py
+++ b/langfun/core/sampling.py
@@ -176,6 +176,7 @@ def _call_fn(example):
   for _, result, error in concurrent.concurrent_map(
       _call_fn,
       pg_sample_fn(sampling_space, num_examples=num_examples),
+      silence_on_errors=concurrent.RetryError,
       max_workers=max_workers
   ):
     if error is None:
diff --git a/requirements.txt b/requirements.txt
index e61adf17..a37358bd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,3 +2,4 @@ jinja2>=3.1.2
 openai>=0.18.1
 pyglove>=0.4.3
 termcolor==1.1.0
+tqdm>=4.64.1
\ No newline at end of file