i'm trying to use TensorFlow on a dataset with has a few Categorical variables. I've encoded them with dummies but it looks like its causing trouble and TF is complaining that the dataset is not dense.
Or is the reason for the error something totally different ?
I'm trying to run a simple Neural Network Model with 1 hidden layer with stochastic gradient. The code was working when the input was numeric variables (images of digits from MNIST)
--------------------------------------------------------------------------
ValueError Traceback (most recent call last) <ipython-input-473-7517101e1879> in <module>()
37 return(test_acc,round(l,5))
38
---> 39 define_batch(0.005)
40 run_batch()
<ipython-input-472-48b4e30f8e9e> in define_batch(beta)
11 shape=(batch_size, num_var))
12 tf_train_labels = tf.placeholder(tf.float32, shape=(batch_size, num_labels))
---> 13 tf_valid_dataset = tf.constant(valid_dataset)
14 tf_test_dataset = tf.constant(test_dataset)
15
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tensorflow/python/ops/constant_op.pyc in constant(value, dtype, shape, name)
159 tensor_value = attr_value_pb2.AttrValue()
160 tensor_value.tensor.CopyFrom(
--> 161 tensor_util.make_tensor_proto(value, dtype=dtype, shape=shape))
162 dtype_value = attr_value_pb2.AttrValue(type=tensor_value.tensor.dtype)
163 const_tensor = g.create_op(
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tensorflow/python/framework/tensor_util.pyc in make_tensor_proto(values, dtype, shape)
320 nparray = np.array(values, dtype=np_dt)
321 if list(nparray.shape) != _GetDenseDimensions(values):
--> 322 raise ValueError("Argument must be a dense tensor: %s" % values)
323 # python/numpy default float type is float64. We prefer float32 instead.
324 if (nparray.dtype == np.float64) and dtype is None:
ValueError: Argument must be a dense tensor: Tuesday Wednesday Thursday Friday Saturday Sunday CENTRAL \ 736114
0.0 0.0 0.0 0.0 1.0 0.0 0.0 437148 0.0 0.0 1.0 0.0 0.0 0.0 0.0 605041 0.0 0.0 0.0 0.0 0.0 0.0 0.0 444608 0.0 0.0 0.0 0.0 1.0 0.0 0.0 695549 0.0 0.0 0.0 0.0 1.0 0.0 0.0 662807 0.0 0.0 0.0 1.0 0.0 0.0 0.0 238635 0.0 0.0 0.0 0.0 0.0 1.0 0.0 549524 0.0 0.0 0.0 1.0 0.0 0.0 0.0 705478 1.0 0.0 0.0 0.0 0.0 0.0 0.0 557716 0.0 0.0 0.0 1.0 0.0 0.0 0.0 41808 0.0 0.0 0.0 0.0 0.0 1.0 0.0 227235 1.0 0.0 0.0 0.0 0.0 0.0 0.0 848719 0.0 0.0 0.0 0.0 0.0 0.0 0.0 731202 0.0 0.0 0.0 0.0 1.0 0.0 0.0 467516 1.0 0.0 0.0 0.0 0.0 0.0 1.0
Here is an excerpt from the code
# Adding regularization to the 1 hidden layer network
def define_batch(beta):
batch_size = 128
num_RELU =256
graph1 = tf.Graph()
with graph1.as_default():
# Input data. For the training data, we use a placeholder that will be fed
# at run time with a training minibatch.
tf_train_dataset = tf.placeholder(tf.float32,
shape=(batch_size, num_var))
tf_train_labels = tf.placeholder(tf.float32, shape=(batch_size, num_labels))
tf_valid_dataset = tf.constant(valid_dataset)
tf_test_dataset = tf.constant(test_dataset)
# Variables.
weights_RELU = tf.Variable(
tf.truncated_normal([num_var, num_RELU]))
biases_RELU = tf.Variable(tf.zeros([num_RELU]))
weights_layer1 = tf.Variable(
tf.truncated_normal([num_RELU, num_labels]))
biases_layer1 = tf.Variable(tf.zeros([num_labels]))
# Training computation.
logits_RELU = tf.matmul(tf_train_dataset, weights_RELU) + biases_RELU
RELU_vec = tf.nn.relu(logits_RELU)
logits_layer = tf.matmul(RELU_vec, weights_layer1) + biases_layer1
# loss = tf.reduce_mean(
# tf.nn.softmax_cross_entropy_with_logits(logits_layer, tf_train_labels))
cross_entropy = tf.nn.softmax_cross_entropy_with_logits(logits_layer, tf_train_labels,name="cross_entropy")
l2reg = tf.reduce_sum(tf.square(weights_RELU))+tf.reduce_sum(tf.square(weights_layer1))
beta = 0.005
loss = tf.reduce_mean(cross_entropy+beta*l2reg)
# Optimizer.
optimizer = tf.train.GradientDescentOptimizer(0.3).minimize(loss)
# Predictions for the training, validation, and test data.
train_prediction = tf.nn.softmax(logits_layer)
valid_prediction = tf.nn.softmax(
tf.matmul(tf.nn.relu((tf.matmul(tf_valid_dataset, weights_RELU) + biases_RELU)),weights_layer1)+biases_layer1)
test_prediction =tf.nn.softmax(
tf.matmul(tf.nn.relu((tf.matmul(tf_test_dataset, weights_RELU) + biases_RELU)),weights_layer1)+biases_layer1)
import datetime
startTime = datetime.datetime.now()
num_steps = 301 # change to 3001
def run_batch():
with tf.Session(graph=graph1) as session:
tf.initialize_all_variables().run()
print("Initialized")
for step in range(num_steps):
# Pick an offset within the training data, which has been randomized.
# Note: we could use better randomization across epochs.
offset = (step * batch_size) % (train_labels.shape[0] - batch_size)
# Generate a minibatch.
batch_data = train_dataset[offset:(offset + batch_size), :]
batch_labels = train_labels[offset:(offset + batch_size), :]
# Prepare a dictionary telling the session where to feed the minibatch.
# The key of the dictionary is the placeholder node of the graph to be fed,
# and the value is the numpy array to feed to it.
feed_dict = {tf_train_dataset : batch_data, tf_train_labels : batch_labels}
_, l, predictions, logits = session.run(
[optimizer, loss,train_prediction,logits_RELU], feed_dict=feed_dict)
if (step % 500 == 0):
print("Minibatch loss at step %d: %f" % (step, l))
print("Minibatch accuracy: %.1f%%" % accuracy(predictions, batch_labels))
print("Validation accuracy: %.1f%%" % accuracy(
valid_prediction.eval(), valid_labels))
test_acc = accuracy(test_prediction.eval(), test_labels)
print("Test accuracy: %.1f%%" % test_acc)
print('loss=%s' % l)
x = datetime.datetime.now() - startTime
print(x)
return(test_acc,round(l,5))
define_batch(0.005)
run_batch()
EDIT: @gdhal thanks for looking at it
train_dataset is a pandas dataframe
train_dataset.columns
Index([u'Tuesday', u'Wednesday', u'Thursday', u'Friday', u'Saturday',
u'Sunday', u'CENTRAL', u'INGLESIDE', u'MISSION', u'NORTHERN', u'PARK',
u'RICHMOND', u'SOUTHERN', u'TARAVAL', u'TENDERLOIN', u' 3H - 4H',
u' 5H - 6H', u' 7H - 8H', u' 9H - 10H', u'11H - 12H', u'13H - 14H',
u'15H - 16H', u'17H - 18H', u'19H - 20H', u'21H - 22H', u'23H - 0H',
u'Xnorm', u'Ynorm', u'Hournorm'],
dtype='object')
all the variables are dummies (taking 0 or 1 values) except the last 3 variables (Xnorm, Ynorm, and Hournorm) which are numerical values normalized to [0,1] interval. valid_dataset and test_dataset have the same format
train_labels is a pandas series
train_labels.describe()
count 790184
unique 39
top LARCENY/THEFT
freq 157434
Name: Category, dtype: object
valid_labels, and test_labels have the same format
Try feeding a numpy array instead of a pandas dataframe.