## Description
ClassCastException when using executor/forward in cojure-mxnet with 3 args
## Environment info (Required)
```
----------Python Info----------
('Version :', '2.7.13')
('Compiler :', 'GCC 6.3.0 20170516')
('Build :', ('default', 'Nov 24 2017 17:33:09'))
('Arch :', ('64bit', 'ELF'))
------------Pip Info-----------
No corresponding pip install for current python.
----------MXNet Info-----------
No MXNet installed.
----------System Info----------
('Platform :', 'Linux-4.9.0-8-amd64-x86_64-with-debian-buster-sid')
('system :', 'Linux')
('node :', 'htx9a')
('release :', '4.9.0-8-amd64')
('version :', '#1 SMP Debian 4.9.110-3+deb9u4 (2018-08-21)')
----------Hardware Info----------
('machine :', 'x86_64')
('processor :', '')
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 1
Core(s) per socket: 1
Socket(s): 4
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 94
Model name: Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz
Stepping: 3
CPU MHz: 2711.247
BogoMIPS: 5424.15
Hypervisor vendor: VMware
Virtualization type: full
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 8192K
NUMA node0 CPU(s): 0-3
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm
constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc
aperfmperf pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm
3dnowprefetch epb invpcid_single kaiser fsgsbase tsc_adjust bmi1 hle avx2 smep
bmi2 invpcid rtm rdseed adx smap xsaveopt dtherm ida arat pln pts hwp
hwp_notify hwp_act_window hwp_epp
```
Package used (Python/R/Scala/Julia): Clojure
I am using Clojure 1.9.0
Java version: openjdk 1.8.0_181
## Build info (Required if built from source)
Compiler: gcc
MXNet commit hash: db295eff3
Build config:
make -j4 USE_CUDA=0 USE_BLAS=openblas
## Minimum reproducible example
``` clojure
(ns mynn.tut
(:require [org.apache.clojure-mxnet.ndarray :as nda]
[org.apache.clojure-mxnet.executor :as exe]
[org.apache.clojure-mxnet.symbol :as sym]
[t6.from-scala.core :as $]))
(def ex (sym/bind c {"a" (nda/ones [2 3])
"b" (nda/ones [2 3])}))
(exe/forward ex false {"a" (nda/ones [2 3])})
;; => ClassCastException Cannot cast scala.collection.immutable.Map$Map1 to
scala.collection.Seq
(exe/forward ex false ($/immutable-list ($/tuple "a" (nda/ones [2 3]))))
;; => nil (no error)
```
## What have you tried to solve it?
Need to fix the coercion of 3rd arg of executor/forward to generate Seq instead
of Map
[ Full content available at:
https://github.com/apache/incubator-mxnet/issues/12627 ]
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