TensorFlow: InternalError: Blas SGEMM launch failed

Question

When I run sess.run(train_step, feed_dict={x: batch_xs, y_: batch_ys}) I get InternalError: Blas SGEMM launch failed. Here is the full error and stack trace:

InternalErrorTraceback (most recent call last)
<ipython-input-9-a3261a02bdce> in <module>()
      1 batch_xs, batch_ys = mnist.train.next_batch(100)
----> 2 sess.run(train_step, feed_dict={x: batch_xs, y_: batch_ys})

/usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.pyc in run(self, fetches, feed_dict, options, run_metadata)
    338     try:
    339       result = self._run(None, fetches, feed_dict, options_ptr,
--> 340                          run_metadata_ptr)
    341       if run_metadata:
    342         proto_data = tf_session.TF_GetBuffer(run_metadata_ptr)

/usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.pyc in _run(self, handle, fetches, feed_dict, options, run_metadata)
    562     try:
    563       results = self._do_run(handle, target_list, unique_fetches,
--> 564                              feed_dict_string, options, run_metadata)
    565     finally:
    566       # The movers are no longer used. Delete them.

/usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.pyc in _do_run(self, handle, target_list, fetch_list, feed_dict, options, run_metadata)
    635     if handle is None:
    636       return self._do_call(_run_fn, self._session, feed_dict, fetch_list,
--> 637                            target_list, options, run_metadata)
    638     else:
    639       return self._do_call(_prun_fn, self._session, handle, feed_dict,

/usr/local/lib/python2.7/dist-packages/tensorflow/python/client/session.pyc in _do_call(self, fn, *args)
    657       # pylint: disable=protected-access
    658       raise errors._make_specific_exception(node_def, op, error_message,
--> 659                                             e.code)
    660       # pylint: enable=protected-access
    661 

InternalError: Blas SGEMM launch failed : a.shape=(100, 784), b.shape=(784, 10), m=100, n=10, k=784
     [[Node: MatMul = MatMul[T=DT_FLOAT, transpose_a=false, transpose_b=false, _device="/job:localhost/replica:0/task:0/gpu:0"](_recv_Placeholder_0/_4, Variable/read)]]
Caused by op u'MatMul', defined at:
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/local/lib/python2.7/dist-packages/ipykernel/__main__.py", line 3, in <module>
    app.launch_new_instance()
  File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 596, in launch_instance
    app.start()
  File "/usr/local/lib/python2.7/dist-packages/ipykernel/kernelapp.py", line 442, in start
    ioloop.IOLoop.instance().start()
  File "/usr/local/lib/python2.7/dist-packages/zmq/eventloop/ioloop.py", line 162, in start
    super(ZMQIOLoop, self).start()
  File "/usr/local/lib/python2.7/dist-packages/tornado/ioloop.py", line 883, in start
    handler_func(fd_obj, events)
  File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 275, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/zmq/eventloop/zmqstream.py", line 440, in _handle_events
    self._handle_recv()
  File "/usr/local/lib/python2.7/dist-packages/zmq/eventloop/zmqstream.py", line 472, in _handle_recv
    self._run_callback(callback, msg)
  File "/usr/local/lib/python2.7/dist-packages/zmq/eventloop/zmqstream.py", line 414, in _run_callback
    callback(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 275, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/ipykernel/kernelbase.py", line 276, in dispatcher
    return self.dispatch_shell(stream, msg)
  File "/usr/local/lib/python2.7/dist-packages/ipykernel/kernelbase.py", line 228, in dispatch_shell
    handler(stream, idents, msg)
  File "/usr/local/lib/python2.7/dist-packages/ipykernel/kernelbase.py", line 391, in execute_request
    user_expressions, allow_stdin)
  File "/usr/local/lib/python2.7/dist-packages/ipykernel/ipkernel.py", line 199, in do_execute
    shell.run_cell(code, store_history=store_history, silent=silent)
  File "/usr/local/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 2723, in run_cell
    interactivity=interactivity, compiler=compiler, result=result)
  File "/usr/local/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 2825, in run_ast_nodes
    if self.run_code(code, result):
  File "/usr/local/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 2885, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-4-d7414c4b6213>", line 4, in <module>
    y = tf.nn.softmax(tf.matmul(x, W) + b)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/math_ops.py", line 1036, in matmul
    name=name)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/gen_math_ops.py", line 911, in _mat_mul
    transpose_b=transpose_b, name=name)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/op_def_library.py", line 655, in apply_op
    op_def=op_def)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/framework/ops.py", line 2154, in create_op
    original_op=self._default_original_op, op_def=op_def)
  File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/framework/ops.py", line 1154, in __init__
    self._traceback = _extract_stack()

Stack: EC2 g2.8xlarge machine, Ubuntu 14.04

I suspect it's a GPU memory issue. I ran `mnist_softmax.py` (taken from tensorflow page). On my PC with GTX950 (2Gb vram) I get this error. On my laptop with Quadro M2000M (4Gb vram) it runs fines. Both systems are using anaconda with python 3.5 and tensorflow 1.0 — mark jay, Apr 12 '17 at 16:40

score 108 · Accepted Answer · answered Sep 06 '16 at 16:24

108

Old question, but may help others.
Try to close interactive sessions active in other processes (if IPython Notebook - just restart kernels). This helped me!

Additionally, I use this code to close local sessions in this kernel during experiments:

if 'session' in locals() and session is not None:
    print('Close interactive session')
    session.close()

answered Sep 06 '16 at 16:24

erko

1,317
1
9
14

Could you specify which library has to be imported to use "session"? – Desperate Morty Aug 14 '21 at 09:51

score 10 · Answer 2 · edited Mar 31 '17 at 01:13

I encountered this problem and solved it by setting allow_soft_placement=True and gpu_options = tf.GPUOptions(per_process_gpu_memory_fraction=0.3), which specifically define the fraction of memory of GPU been used. I guess this has helped to avoid two tensorflow processes competing for the GPU memory.

gpu_options = tf.GPUOptions(per_process_gpu_memory_fraction=0.3)
sess = tf.Session(config=tf.ConfigProto(
  allow_soft_placement=True, log_device_placement=True))

score 4 · Answer 3 · answered Jun 01 '16 at 17:46

I got this error when running Tensorflow Distributed. Did you check if any of the workers were reporting CUDA_OUT_OF_MEMORY errors? If this is the case it may have to do with where you place your weight and bias variables. E.g.

with tf.device("/job:paramserver/task:0/cpu:0"):
   W = weight_variable([input_units, num_hidden_units])       
   b = bias_variable([num_hidden_units])

score 4 · Answer 4 · edited Jan 17 '17 at 16:10

My environment is Python 3.5, Tensorflow 0.12 and Windows 10 (no Docker). I am training neural networks in both CPU and GPU. I came across the same error InternalError: Blas SGEMM launch failed whenever training in the GPU.

I could not find the reason why this error happens but I managed to run my code in the GPU by avoiding the tensorflow function tensorflow.contrib.slim.one_hot_encoding(). Instead, I do the one-hot-encoding operation in numpy (input and output variables).

The following code reproduces the error and the fix. It is a minimal setup to learn the y = x ** 2 function using gradient descent.

import numpy as np
import tensorflow as tf
import tensorflow.contrib.slim as slim

def test_one_hot_encoding_using_tf():

    # This function raises the "InternalError: Blas SGEMM launch failed" when run in the GPU

    # Initialize
    tf.reset_default_graph()
    input_size = 10
    output_size = 100
    input_holder = tf.placeholder(shape=[1], dtype=tf.int32, name='input')
    output_holder = tf.placeholder(shape=[1], dtype=tf.int32, name='output')

    # Define network
    input_oh = slim.one_hot_encoding(input_holder, input_size)
    output_oh = slim.one_hot_encoding(output_holder, output_size)
    W1 = tf.Variable(tf.random_uniform([input_size, output_size], 0, 0.01))
    output_v = tf.matmul(input_oh, W1)
    output_v = tf.reshape(output_v, [-1])

    # Define updates
    loss = tf.reduce_sum(tf.square(output_oh - output_v))
    trainer = tf.train.GradientDescentOptimizer(learning_rate=0.1)
    update_model = trainer.minimize(loss)

    # Optimize
    init = tf.initialize_all_variables()
    steps = 1000

    # Force CPU/GPU
    config = tf.ConfigProto(
        # device_count={'GPU': 0}  # uncomment this line to force CPU
    )

    # Launch the tensorflow graph
    with tf.Session(config=config) as sess:
        sess.run(init)

        for step_i in range(steps):

            # Get sample
            x = np.random.randint(0, 10)
            y = np.power(x, 2).astype('int32')

            # Update
            _, l = sess.run([update_model, loss], feed_dict={input_holder: [x], output_holder: [y]})

        # Check model
        print('Final loss: %f' % l)

def test_one_hot_encoding_no_tf():

    # This function does not raise the "InternalError: Blas SGEMM launch failed" when run in the GPU

    def oh_encoding(label, num_classes):
        return np.identity(num_classes)[label:label + 1].astype('int32')

    # Initialize
    tf.reset_default_graph()
    input_size = 10
    output_size = 100
    input_holder = tf.placeholder(shape=[1, input_size], dtype=tf.float32, name='input')
    output_holder = tf.placeholder(shape=[1, output_size], dtype=tf.float32, name='output')

    # Define network
    W1 = tf.Variable(tf.random_uniform([input_size, output_size], 0, 0.01))
    output_v = tf.matmul(input_holder, W1)
    output_v = tf.reshape(output_v, [-1])

    # Define updates
    loss = tf.reduce_sum(tf.square(output_holder - output_v))
    trainer = tf.train.GradientDescentOptimizer(learning_rate=0.1)
    update_model = trainer.minimize(loss)

    # Optimize
    init = tf.initialize_all_variables()
    steps = 1000

    # Force CPU/GPU
    config = tf.ConfigProto(
        # device_count={'GPU': 0}  # uncomment this line to force CPU
    )

    # Launch the tensorflow graph
    with tf.Session(config=config) as sess:
        sess.run(init)

        for step_i in range(steps):

            # Get sample
            x = np.random.randint(0, 10)
            y = np.power(x, 2).astype('int32')

            # One hot encoding
            x = oh_encoding(x, 10)
            y = oh_encoding(y, 100)

            # Update
            _, l = sess.run([update_model, loss], feed_dict={input_holder: x, output_holder: y})

        # Check model
        print('Final loss: %f' % l)

score 3 · Answer 5 · answered Aug 11 '17 at 08:55

3

maybe you not free your gpu rigthly , if you are using linux,try "ps -ef | grep python" to see what jobs are using GPU. then kill them

answered Aug 11 '17 at 08:55

Shouguo

31
2

score 2 · Answer 6 · answered Sep 02 '17 at 19:45

In my case, I had 2 python consoles open, both using keras/tensorflow. As I closed the old console (forgotten from previous day), everything started to work correctly.

So it is good to check, if you do not have multiple consoles / processes occupying GPU.

score 2 · Answer 7 · answered Dec 13 '17 at 00:55

2

I closed all other Jupyter Sessions running and this solved the problem. I think It was GPU memory issue.

answered Dec 13 '17 at 00:55

Stupid420

1,347
3
19
44

Uvuvwevwevwe · Answer 8 · 2019-01-13T02:29:02.973

For me, I got this problem when I tried to run multiple tensorflow processes (e.g. 2) and both of them require to access GPU resources.

A simple solution is to make sure there has to be only one tensorflow process running at a single time.

For more details, you can see here.

To be clear, tensorflow will try (by default) to consume all available GPUs. It cannot be run with other programs also active. Closing. Feel free to reopen if this is actually another problem.

score 1 · Answer 9 · answered Oct 24 '18 at 05:55

In my case,

First, I run

conda clean --all

to clean up tarballs and unused packages.

Then, I restart IDE (Pycharm in this case) and it works well. Environment: anaconda python 3.6, windows 10 64bit. I install tensorflow-gpu by a command provided on the anaconda website.

score 1 · Answer 10 · answered Jan 30 '20 at 05:30

2.0 Compatible Answer: Providing 2.0 Code for erko's answer for the benefit of the Community.

session = tf.compat.v1.Session()

if 'session' in locals() and session is not None:
    print('Close interactive session')
    session.close()

score 0 · Answer 11 · edited Dec 04 '17 at 01:47

0

In my case, the network filesystem under which libcublas.so was located simply died. The node was rebooted and everything was fine. Just to add another point to the dataset.

edited Dec 04 '17 at 01:47

oarfish

4,116
4
37
66

answered Aug 25 '17 at 14:15

user3098688

41
1

score 0 · Answer 12 · answered Jan 19 '18 at 15:41

0

I encountered this error when running Keras CuDNN tests in parallel with pytest-xdist. The solution was to run them serially.

answered Jan 19 '18 at 15:41

Bohumir Zamecnik

2,450
28
23

score 0 · Answer 13 · answered Jan 20 '18 at 02:24

For me, I got this error when using Keras, and Tensorflow was the the backend. It was because the deep learning environment in Anaconda was not activated properly, as a result, Tensorflow didn't kick in properly either. I noticed this since the last time I activated my deep learning environment (which is called dl), the prompt changed in my Anaconda Prompt to this:

(dl) C:\Users\georg\Anaconda3\envs\dl\etc\conda\activate.d>set "KERAS_BACKEND=tensorflow"

While it only had the dl before then. Therefore, what I did to get rid of the above error was to close my jupyter notebook and Anaconda prompt, then relaunch, for several times.

score 0 · Answer 14 · answered Feb 19 '18 at 16:32

I encountered this error after changing OS to Windows 10 recently, and I never encountered this before when using windows 7.

The error occurs if I load my GPU Tensorflow model when an another GPU program is running; it's my JCuda model loaded as socket server, which is not large. If I close my other GPU program(s), this Tensorflow model can be loaded very successfully.

This JCuda program is not large at all, just around 70M, and in comparison this Tensorflow model is more than 500M and much larger. But I am using 1080 ti, which has much memory. So it would be probably not an out-of-memory progblem, and it would perhaps be some tricky internal issue of Tensorflow regarding OS or Cuda. (PS: I am using Cuda version 8.0.44 and haven't downloaded a newer version.)

score 0 · Answer 15 · answered Apr 22 '18 at 09:47

0

Restarting my Jupyter processes wasn't enough; I had to reboot my computer.

answered Apr 22 '18 at 09:47

DharmaTurtle

6,858
6
38
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score 0 · Answer 16 · answered May 23 '19 at 23:22

In my case, it is enough to open the Jupyter Notebooks in separate servers.

This error only occurs with me if I try using more than one tensorflow/keras model in the same server. It doesn't matter if open one notebook, execute it, than close and try opening another. If they are being loaded in the same Jupyter server the error always happens.

TensorFlow: InternalError: Blas SGEMM launch failed

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