Error in python 3.5: can't add `map` results together -

-

i have piece of code using python 2.7 , trying convert can use python 3.5 error on flowing code due map. best way resolve ?

file "/users/newbie/anaconda3/lib/python3.5/site-packages/keras/caffe/caffe_utils.py", line 74, in parse_network blobs = top_blobs + bottom_blobs

typeerror: unsupported operand type(s) +: 'map' , 'map'

 def parse_network(layers, phase):  '''     construct network layers making blobs ,  layers(operations) nodes. '''   nb_layers = len(layers)   network = {}     l in range(nb_layers):      included = false      try:         # try see if layer phase specific         if layers[l].include[0].phase == phase:             included = true      except indexerror:         included = true       if included:         layer_key = 'caffe_layer_' + str(l)  # actual layers, special annotation mark them         if layer_key not in network:             network[layer_key] = []         top_blobs = map(str, layers[l].top)         bottom_blobs = map(str, layers[l].bottom)         blobs = top_blobs + bottom_blobs          blob in blobs:             if blob not in network:                 network[blob] = []         blob in bottom_blobs:             network[blob].append(layer_key)         blob in top_blobs:                 network[layer_key].append(blob)  network = acyclic(network)  # convert acyclic  network = merge_layer_blob(network)  # eliminate 'blobs', have layers  return network

map in python 3 return iterator, while map in python 2 returns list:

python 2:

>>> type(map(abs, [1, -2, 3, -4])) <type 'list'>

python 3:

>>> type(map(abs, [1, -2, 3, -4])) <class 'map'>

(note map bit more special, it's not list.)

you can't add iterators. can chain them, using itertools.chain:

>>> itertools import chain >>> chain(map(abs, [1, -2, 3, -4]), map(abs, [5, -6, 7, -8])) <itertools.chain object @ 0x7fe0dc0775f8>

for final result, either have loop on chain, or evaluate it:

>>> value in chain(map(abs, [1, -2, 3, -4]), map(abs, [5, -6, 7, -8])): ...     print(value) ...  1 2 3 4 5 6 7 8

or

>>> list(chain(map(abs, [1, -2, 3, -4]), map(abs, [5, -6, 7, -8]))) [1, 2, 3, 4, 5, 6, 7, 8]

note former comes more naturally, , evaluating iterator last example should avoided unless absolutely necessary: can save memory , possibly computational power (for example, there break in loop, further values not have evaluated).


Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

java - Copying object fields -

-
what best way of copying classes when need have 2 independent variables? have simple class: public class myclass { boolean = false; string b= "not empty"; } do need make method : assign(myclass data ) { a= data.a; b= data.b; } is there automatic method copy (duplicate) objects in java? do need make method : pretty close. instead of making method, should make constructor. such constructors called copy constructor , , create them this: myclass(myclass data) { = data.a; b = data.b; } and create copy of instance, use constructor this: myclass obj1 = new myclass(); myclass obj2 = new myclass(obj1); copy constructor can tedious : using copy constructor create deep-copy can tedious, when class has mutable fields. in case, assignment create copy of reference, , not object itself. have create copy of fields (if want deep copy). can go recursive. a better way create deep copy serialize , deserialize object. why not use clone()? ...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more