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python - TensorFlow matmul：Blas xGEMMBatched 启动失败

问题描述

当我尝试在 GPU 上使用 tf.matmul 函数时，出现以下错误：

InternalError: Blas xGEMMBatched launch failed

如果N函数calc()中的值设置为小于 15 的值，则它可以工作。

我正在运行 tensorflow 1.8.0 和 Cuda V9.1.85。只有一个 Python 进程在 GPU 上工作，并且没有其他打开的会话。我还有足够的 GPU 内存可供使用（见附图）。

更改CUDA_VISIBLE_DEVICES值不会显示任何效果。更改ConfigProto()设置也无济于事。也tf.matmul不能解决问题。

这是我正在运行的代码：

import tensorflow as tf
import numpy as np

import os
os.environ["CUDA_VISIBLE_DEVICES"]="0"

config = tf.ConfigProto()
config.gpu_options.allow_growth=True
tf.Session(config=config).close()

def calc():
    N = 15 # works for N <= 14
    a = 16
    b = 8
    X = np.random.rand(N, 11520, b, 1).astype(np.float32)
    print(X.nbytes*1e-6, "MB")
    W = np.random.rand(N, 11520, a, b).astype(np.float32)
    print(W.nbytes*1e-6, "MB")
    X_ = tf.constant(X, name="X-constant", dtype=tf.float32)
    W_ = tf.constant(W, name="W-constant", dtype=tf.float32)

    # return tf.matmul(W_, X_, name="mymatmul")
    return W_ @ X_

tf.reset_default_graph()
a = calc()
sess = tf.Session()
sess.run(tf.global_variables_initializer())
b = sess.run(a)
sess.close()
print(b.shape)

这是我得到的输出：

5.529599999999999 MB
88.47359999999999 MB

---------------------------------------------------------------------------
InternalError                             Traceback (most recent call last)
/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py in _do_call(self, fn, *args)
   1321     try:
-> 1322       return fn(*args)
   1323     except errors.OpError as e:

/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py in _run_fn(feed_dict, fetch_list, target_list, options, run_metadata)
   1306       return self._call_tf_sessionrun(
-> 1307           options, feed_dict, fetch_list, target_list, run_metadata)
   1308 

/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py in _call_tf_sessionrun(self, options, feed_dict, fetch_list, target_list, run_metadata)
   1408           self._session, options, feed_dict, fetch_list, target_list,
-> 1409           run_metadata)
   1410     else:

InternalError: Blas xGEMMBatched launch failed : a.shape=[172800,16,8], b.shape=[172800,8,1], m=16, n=1, k=8, batch_size=172800
     [[Node: matmul = BatchMatMul[T=DT_FLOAT, adj_x=false, adj_y=false, _device="/job:localhost/replica:0/task:0/device:GPU:0"](W-constant, X-constant)]]

During handling of the above exception, another exception occurred:

InternalError                             Traceback (most recent call last)
<ipython-input-5-013153235a1a> in <module>()
      3 sess = tf.Session()
      4 sess.run(tf.global_variables_initializer())
----> 5 b = sess.run(a)
      6 sess.close()
      7 print(b.shape)

/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py in run(self, fetches, feed_dict, options, run_metadata)
    898     try:
    899       result = self._run(None, fetches, feed_dict, options_ptr,
--> 900                          run_metadata_ptr)
    901       if run_metadata:
    902         proto_data = tf_session.TF_GetBuffer(run_metadata_ptr)

/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py in _run(self, handle, fetches, feed_dict, options, run_metadata)
   1133     if final_fetches or final_targets or (handle and feed_dict_tensor):
   1134       results = self._do_run(handle, final_targets, final_fetches,
-> 1135                              feed_dict_tensor, options, run_metadata)
   1136     else:
   1137       results = []

/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py in _do_run(self, handle, target_list, fetch_list, feed_dict, options, run_metadata)
   1314     if handle is None:
   1315       return self._do_call(_run_fn, feeds, fetches, targets, options,
-> 1316                            run_metadata)
   1317     else:
   1318       return self._do_call(_prun_fn, handle, feeds, fetches)

/usr/local/lib/python3.6/dist-packages/tensorflow/python/client/session.py in _do_call(self, fn, *args)
   1333         except KeyError:
   1334           pass
-> 1335       raise type(e)(node_def, op, message)
   1336 
   1337   def _extend_graph(self):

InternalError: Blas xGEMMBatched launch failed : a.shape=[172800,16,8], b.shape=[172800,8,1], m=16, n=1, k=8, batch_size=172800
     [[Node: matmul = BatchMatMul[T=DT_FLOAT, adj_x=false, adj_y=false, _device="/job:localhost/replica:0/task:0/device:GPU:0"](W-constant, X-constant)]]

Caused by op 'matmul', defined at:
  File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/usr/local/lib/python3.6/dist-packages/ipykernel_launcher.py", line 16, in <module>
    app.launch_new_instance()
  File "/usr/local/lib/python3.6/dist-packages/traitlets/config/application.py", line 658, in launch_instance
    app.start()
  File "/usr/local/lib/python3.6/dist-packages/ipykernel/kernelapp.py", line 486, in start
    self.io_loop.start()
  File "/usr/local/lib/python3.6/dist-packages/tornado/platform/asyncio.py", line 127, in start
    self.asyncio_loop.run_forever()
  File "/usr/lib/python3.6/asyncio/base_events.py", line 422, in run_forever
    self._run_once()
  File "/usr/lib/python3.6/asyncio/base_events.py", line 1432, in _run_once
    handle._run()
  File "/usr/lib/python3.6/asyncio/events.py", line 145, in _run
    self._callback(*self._args)
  File "/usr/local/lib/python3.6/dist-packages/tornado/platform/asyncio.py", line 117, in _handle_events
    handler_func(fileobj, events)
  File "/usr/local/lib/python3.6/dist-packages/tornado/stack_context.py", line 276, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/zmq/eventloop/zmqstream.py", line 450, in _handle_events
    self._handle_recv()
  File "/usr/local/lib/python3.6/dist-packages/zmq/eventloop/zmqstream.py", line 480, in _handle_recv
    self._run_callback(callback, msg)
  File "/usr/local/lib/python3.6/dist-packages/zmq/eventloop/zmqstream.py", line 432, in _run_callback
    callback(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/tornado/stack_context.py", line 276, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/ipykernel/kernelbase.py", line 283, in dispatcher
    return self.dispatch_shell(stream, msg)
  File "/usr/local/lib/python3.6/dist-packages/ipykernel/kernelbase.py", line 233, in dispatch_shell
    handler(stream, idents, msg)
  File "/usr/local/lib/python3.6/dist-packages/ipykernel/kernelbase.py", line 399, in execute_request
    user_expressions, allow_stdin)
  File "/usr/local/lib/python3.6/dist-packages/ipykernel/ipkernel.py", line 208, in do_execute
    res = shell.run_cell(code, store_history=store_history, silent=silent)
  File "/usr/local/lib/python3.6/dist-packages/ipykernel/zmqshell.py", line 537, in run_cell
    return super(ZMQInteractiveShell, self).run_cell(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/IPython/core/interactiveshell.py", line 2662, in run_cell
    raw_cell, store_history, silent, shell_futures)
  File "/usr/local/lib/python3.6/dist-packages/IPython/core/interactiveshell.py", line 2785, in _run_cell
    interactivity=interactivity, compiler=compiler, result=result)
  File "/usr/local/lib/python3.6/dist-packages/IPython/core/interactiveshell.py", line 2903, in run_ast_nodes
    if self.run_code(code, result):
  File "/usr/local/lib/python3.6/dist-packages/IPython/core/interactiveshell.py", line 2963, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-5-013153235a1a>", line 2, in <module>
    a = calc()
  File "<ipython-input-4-bf0e6012e9e2>", line 13, in calc
    return W_ @ X_
  File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/ops/math_ops.py", line 847, in binary_op_wrapper
    return func(x, y, name=name)
  File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/ops/math_ops.py", line 1976, in matmul
    a, b, adj_x=adjoint_a, adj_y=adjoint_b, name=name)
  File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/ops/gen_math_ops.py", line 1236, in batch_mat_mul
    "BatchMatMul", x=x, y=y, adj_x=adj_x, adj_y=adj_y, name=name)
  File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/op_def_library.py", line 787, in _apply_op_helper
    op_def=op_def)
  File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/ops.py", line 3414, in create_op
    op_def=op_def)
  File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/ops.py", line 1740, in __init__
    self._traceback = self._graph._extract_stack()  # pylint: disable=protected-access

InternalError (see above for traceback): Blas xGEMMBatched launch failed : a.shape=[172800,16,8], b.shape=[172800,8,1], m=16, n=1, k=8, batch_size=172800
     [[Node: matmul = BatchMatMul[T=DT_FLOAT, adj_x=false, adj_y=false, _device="/job:localhost/replica:0/task:0/device:GPU:0"](W-constant, X-constant)]]

标签： pythontensorflow

解决方案

这是一个解决方法，替换tf.matmul为tf.einsum. 但是，您的代码可以在我的机器上使用 NVIDIA 840M（2004 MiB RAM）、cudnn 7.0.5.15 和 cuda 9.0.176（也许降级有帮助？）。

import tensorflow as tf
import numpy as np

sess = tf.Session()

N = 20
M = 11520
a = 16
b = 8

W = np.random.rand(N, M, a, b).astype(np.float32)
X = np.random.rand(N, M, b, 1).astype(np.float32)

# tf.einsum does not support numpy arrays, so wrap W and X in tf.constants
W2 = tf.constant(W)
X2 = tf.constant(X)

# tf.einsum does not support "..." as seen later in np.einsum
WX = tf.einsum("uvik,uvkj->uvij", W2, X2)
# same as:
#WX = tf.matmul(W2, X2)

# calculate W@X using tf.einsum
result1 = sess.run(WX)
# calculate W@X using np.einsum
result2 = np.einsum("...ik,...kj->...ij", W, X)
# calculate W@X by hand (just for illustrative purpose, too slow for practical use)
result3 = np.zeros((N, M, a, 1), dtype=np.float32)
for i in range(a):
    for j in range(1):
        for k in range(b):
            result3[..., i, j] += W[..., i, k] * X[..., k, j]

# ensure that everything is correct
assert(np.allclose(result1, result2))
assert(np.allclose(result1, result3))

print("everything ok")

sess.close()

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