python - TF: Fetch argument x has invalid type <type 'numpy.float32'>, must be a string or Tensor. (Can not convert a float32 into a Tensor or Operation.) -


i have time series model in tf. it's simple auto-regressive model.

the original y vector of length 100 (n).

i float not tensor error (as per subject). @ second instance though. 

lr = .01 steps = 100  def net(x, w, b):   # x has 2 previous values   x = [x[-1], x[-2], x[-1] - x[-2]]   x = tf.reshape(x, [1, 3])   x = tf.add(tf.matmul(x, w[0]), b[0])   pred = tf.add(tf.matmul(x, w[1]), b[1])   return pred  y_data = y - np.mean(y)  x = tf.placeholder(tf.float32, [2], name='x') y = tf.placeholder(tf.float32, [1], name='y') w = [tf.variable(tf.random_normal([3, 3])), tf.variable(tf.random_normal([3, 1]))] b = [tf.variable(tf.random_normal([1])), tf.variable(tf.random_normal([1]))] pred = net(x, w, b) cost = tf.sqrt(tf.reduce_mean(tf.square(tf.subtract(pred, y)))) optimizer = tf.train.adamoptimizer(learning_rate=lr).minimize(cost)  init = tf.global_variables_initializer() tf.session() sess:   sess.run(init)   step in range(steps):     # random samples of data     ts = np.random.choice(np.arange(2, n), int(n * .5), replace=false)     t in ts:       x_data = [y_data[t - 2], y_data[t - 1]]       y_data_cur = [y_data[t]]       print(x_data, y_data_cur, x, y, pred)       _, cost, p = sess.run([optimizer, cost, pred], feed_dict={x: x_data, y: y_data_cur})       print(cost, p)     if step % 10 == 0:       print(step, cost)

when run model:

_, cost, p = sess.run([optimizer, cost, pred], feed_dict={x: x_data, y: y_data_cur})

you overwriting cost variable, used hold tensorflow tensor cost, evaluated value, next iteration fails. change name of variable:

_, cost_val, p = sess.run([optimizer, cost, pred], feed_dict={x: x_data, y: y_data_cur})

and of course replace cost cost_val in print statements.


Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more