TensorFlow: InternalError: Blas SGEMM launch failed
TensorflowBlasTensorflow Problem Overview
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
Tensorflow Solutions
Solution 1 - Tensorflow
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()
Solution 2 - Tensorflow
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))
Solution 3 - Tensorflow
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])
Solution 4 - Tensorflow
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)
Solution 5 - Tensorflow
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
Solution 6 - Tensorflow
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.
Solution 7 - Tensorflow
I closed all other Jupyter Sessions running and this solved the problem. I think It was GPU memory issue.
Solution 8 - Tensorflow
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.
Solution 9 - Tensorflow
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.
Solution 10 - Tensorflow
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()
Solution 11 - Tensorflow
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.
Solution 12 - Tensorflow
I encountered this error when running Keras CuDNN tests in parallel with pytest-xdist. The solution was to run them serially.
Solution 13 - Tensorflow
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.
Solution 14 - Tensorflow
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.)
Solution 15 - Tensorflow
Restarting my Jupyter processes wasn't enough; I had to reboot my computer.
Solution 16 - Tensorflow
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.