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Deploy tensorflow graphs for insanely-fast model evaluation and export to tensorflow-less environments via numpy.

Project description

Deploy tensorflow graphs for insanely-fast model evaluation and export to tensorflow-less environments via numpy.

Why?

Working with tensorflow is awesome. Installing tensorflow on old OS’s like SL6 isn’t. This is quite a problem when you want to deploy your trained model to one of those machines.

tfdeploy solves this problem while only requiring numpy. It is a single file with less then 150 lines of core code, so you can easily copy it into your project. In addition, tfdeploy is *way faster* than using tensorflow’s Tensor.eval.

Install it via pip

pip install tfdeploy

or by simply copying the file into your project.

How?

The central class is tfdeploy.Model. The following two examples demonstrate how a model can be created from a tensorflow graph, saved to and loaded from disk, and eventually evaluated.

Convert your graph

import tensorflow as tf
import tfdeploy as td

# build your graph
sess = tf.Session()

# use names for input and output layers
x = tf.placeholder("float", shape=[None, 784], name="input")
W = tf.Variable(tf.truncated_normal([784, 100], stddev=0.05))
b = tf.Variable(tf.zeros([100]))
y = tf.nn.softmax(tf.matmul(x, W) + b, name="output")

sess.run(tf.initialize_all_variables())

# ... training ...

# create a tfdeploy model and save it to disk
model = td.Model()
model.add(y) # y and all its ops and related tensors are added recursively
model.save("model.pkl")

Load the model and evaluate (without tensorflow)

import numpy as np
import tfdeploy as td

model = td.Model("model.pkl")

# shorthand to x and y
x = model.get("input")
y = model.get("output")

# evaluate
batch = np.random.rand(10000, 784)
result = y.eval({x: batch})

Write your own Operation

tfdeploy supports most of the Operation’s implemented in tensorflow. However, if you miss one (in that case, submit an issue ;) ) or if you’re using custom layers, you might want to extend tfdeploy:

import tensorflow as tf
import tfdeploy as td

# ... write you model here ...

# let's assume your final tensor "y" relies on an op of type "InvertedSoftmax"
# before creating the td.Model, you should add that op to tfdeploy

class InvertedSoftmax(td.Operation):
    @classmethod
    def func(a):
        e = np.exp(-a)
        return np.divide(e, np.sum(e, axis=-1, keepdims=True))

# now, we're good to go
model = td.Model()
model.add(y)
model.save("model.pkl")

Performance

tfdeploy is lightweight (1 file, < 150 lines of core code) and fast. Internal operations are nearly overhead-free. All mathematical operations use numpy vectorization. On average, evaluation is 70% faster than plain tensorflow. (tba: test with large-scale network)

Test code (based on “Convert your graph”)

batch = np.random.rand(10000, 784)

def test_tf():
    return y.eval(session=sess, feed_dict={x: batch})

x2 = model.get("input")
y2 = model.get("output")
def test_td():
    return y2.eval({x2: batch})

ipython shell:

In [1]: %timeit test_tf()
100 loops, best of 3: 8.78 ms per loop

In [2]: %timeit test_td()
100 loops, best of 3: 2.63 ms per loop

In [3]: 2.63/8.78
Out[3]: 0.2995444191343964

Development

Authors

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